diff --git a/afl/src/engines/mod.rs b/afl/src/engines/mod.rs
index e0a8406874..2bebe91ebc 100644
--- a/afl/src/engines/mod.rs
+++ b/afl/src/engines/mod.rs
@@ -220,7 +220,7 @@ where
         E: Executor<I> + HasObservers<OT>,
         OT: ObserversTuple,
     {
-        executor.reset_observers()?;
+        executor.pre_exec_observers()?;
         executor.run_target(&input)?;
         self.set_executions(self.executions() + 1);
         executor.post_exec_observers()?;
diff --git a/afl/src/executors/mod.rs b/afl/src/executors/mod.rs
index 0d1ead666f..8c33e2cbaa 100644
--- a/afl/src/executors/mod.rs
+++ b/afl/src/executors/mod.rs
@@ -31,8 +31,8 @@ where
 
     /// Reset the state of all the observes linked to this executor
     #[inline]
-    fn reset_observers(&mut self) -> Result<(), AflError> {
-        self.observers_mut().reset_all()
+    fn pre_exec_observers(&mut self) -> Result<(), AflError> {
+        self.observers_mut().pre_exec_all()
     }
 
     /// Run the post exec hook for all the observes linked to this executor
diff --git a/afl/src/feedbacks/mod.rs b/afl/src/feedbacks/mod.rs
index 50ce8ff4dd..1718604fa0 100644
--- a/afl/src/feedbacks/mod.rs
+++ b/afl/src/feedbacks/mod.rs
@@ -309,6 +309,8 @@ where
     }
 }
 
+// TODO: TimeFeedback
+
 /*
 #[derive(Serialize, Deserialize)]
 pub struct MapNoveltiesMetadata {
diff --git a/afl/src/mutators/mutations.rs b/afl/src/mutators/mutations.rs
index 5d641d4d33..e487b7955c 100644
--- a/afl/src/mutators/mutations.rs
+++ b/afl/src/mutators/mutations.rs
@@ -6,35 +6,6 @@ use crate::{
     AflError,
 };
 
-/// The result of a mutation.
-/// If the mutation got skipped, the target
-/// will not be executed with the returned input.
-pub enum MutationResult {
-    Mutated,
-    Skipped,
-}
-
-// TODO maybe the mutator arg is not needed
-/// The generic function type that identifies mutations
-pub type MutationFunction<M, C, I, R> =
-    fn(&mut M, &mut R, &C, &mut I) -> Result<MutationResult, AflError>;
-
-pub trait ComposedByMutations<C, I, R>
-where
-    C: Corpus<I, R>,
-    I: Input,
-    R: Rand,
-{
-    /// Get a mutation by index
-    fn mutation_by_idx(&self, index: usize) -> MutationFunction<Self, C, I, R>;
-
-    /// Get the number of mutations
-    fn mutations_count(&self) -> usize;
-
-    /// Add a mutation
-    fn add_mutation(&mut self, mutation: MutationFunction<Self, C, I, R>);
-}
-
 const ARITH_MAX: u64 = 35;
 
 const INTERESTING_8: [i8; 9] = [-128, -1, 0, 1, 16, 32, 64, 100, 127];
@@ -71,6 +42,36 @@ const INTERESTING_32: [i32; 27] = [
     2147483647,
 ];
 
+/// The result of a mutation.
+/// If the mutation got skipped, the target
+/// will not be executed with the returned input.
+#[derive(Clone, Copy, Debug)]
+pub enum MutationResult {
+    Mutated,
+    Skipped,
+}
+
+// TODO maybe the mutator arg is not needed
+/// The generic function type that identifies mutations
+pub type MutationFunction<M, C, I, R> =
+    fn(&mut M, &mut R, &C, &mut I) -> Result<MutationResult, AflError>;
+
+pub trait ComposedByMutations<C, I, R>
+where
+    C: Corpus<I, R>,
+    I: Input,
+    R: Rand,
+{
+    /// Get a mutation by index
+    fn mutation_by_idx(&self, index: usize) -> MutationFunction<Self, C, I, R>;
+
+    /// Get the number of mutations
+    fn mutations_count(&self) -> usize;
+
+    /// Add a mutation
+    fn add_mutation(&mut self, mutation: MutationFunction<Self, C, I, R>);
+}
+
 #[inline]
 fn self_mem_move(data: &mut [u8], from: usize, to: usize, len: usize) {
     debug_assert!(from + len <= data.len());
diff --git a/afl/src/mutators/scheduled.rs b/afl/src/mutators/scheduled.rs
index 18cf7a31be..81c797bd95 100644
--- a/afl/src/mutators/scheduled.rs
+++ b/afl/src/mutators/scheduled.rs
@@ -1,5 +1,6 @@
 use alloc::vec::Vec;
-use core::marker::PhantomData;
+use core::{fmt, marker::PhantomData};
+use fmt::Debug;
 
 use crate::{
     inputs::{HasBytesVec, Input},
@@ -56,6 +57,23 @@ where
     max_size: usize,
 }
 
+impl<C, I, R> Debug for StdScheduledMutator<C, I, R>
+where
+    C: Corpus<I, R>,
+    I: Input,
+    R: Rand,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "StdScheduledMutator with {} Mutations, max_size: {}, for Input type {}",
+            self.mutations.len(),
+            self.max_size,
+            core::any::type_name::<I>()
+        )
+    }
+}
+
 impl<C, I, R> Mutator<C, I, R> for StdScheduledMutator<C, I, R>
 where
     C: Corpus<I, R>,
diff --git a/afl/src/observers/mod.rs b/afl/src/observers/mod.rs
index 6ea5f09ef2..717b937fc7 100644
--- a/afl/src/observers/mod.rs
+++ b/afl/src/observers/mod.rs
@@ -4,11 +4,13 @@ use alloc::{
     string::{String, ToString},
     vec::Vec,
 };
+use core::time::Duration;
 use serde::{Deserialize, Serialize};
 
 use crate::{
     serde_anymap::{ArrayMut, Cptr},
     tuples::{MatchNameAndType, MatchType, Named, TupleList},
+    utils::current_time,
     AflError,
 };
 
@@ -22,7 +24,7 @@ pub trait Observer: Named + serde::Serialize + serde::de::DeserializeOwned + 'st
     }
 
     /// Resets the observer
-    fn reset(&mut self) -> Result<(), AflError>;
+    fn pre_exec(&mut self) -> Result<(), AflError>;
 
     /// This function is executed after each fuzz run
     #[inline]
@@ -48,11 +50,15 @@ pub trait Observer: Named + serde::Serialize + serde::de::DeserializeOwned + 'st
     }
 }
 
+/// A hastkel-style tuple of observers
 pub trait ObserversTuple:
     MatchNameAndType + MatchType + serde::Serialize + serde::de::DeserializeOwned
 {
     /// Reset all executors in the tuple
-    fn reset_all(&mut self) -> Result<(), AflError>;
+    /// This is called right before the next execution.
+    fn pre_exec_all(&mut self) -> Result<(), AflError>;
+    /// Do whatever you need to do after a run.
+    /// This is called right after the last execution
     fn post_exec_all(&mut self) -> Result<(), AflError>;
     //fn for_each(&self, f: fn(&dyn Observer));
     //fn for_each_mut(&mut self, f: fn(&mut dyn Observer));
@@ -69,7 +75,7 @@ pub trait ObserversTuple:
 }
 
 impl ObserversTuple for () {
-    fn reset_all(&mut self) -> Result<(), AflError> {
+    fn pre_exec_all(&mut self) -> Result<(), AflError> {
         Ok(())
     }
     fn post_exec_all(&mut self) -> Result<(), AflError> {
@@ -85,9 +91,9 @@ where
     Head: Observer,
     Tail: ObserversTuple + TupleList,
 {
-    fn reset_all(&mut self) -> Result<(), AflError> {
-        self.0.reset()?;
-        self.1.reset_all()
+    fn pre_exec_all(&mut self) -> Result<(), AflError> {
+        self.0.pre_exec()?;
+        self.1.pre_exec_all()
     }
 
     fn post_exec_all(&mut self) -> Result<(), AflError> {
@@ -106,6 +112,44 @@ where
     }*/
 }
 
+/// A simple observer, just overlooking the runtime of the target.
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct TimeObserver {
+    name: String,
+    start_time: Duration,
+    last_runtime: Option<Duration>,
+}
+
+impl TimeObserver {
+    /// Creates a new TimeObserver with the given name.
+    pub fn new(name: &'static str) -> Self {
+        Self {
+            name: name.to_string(),
+            start_time: Duration::from_secs(0),
+            last_runtime: None,
+        }
+    }
+}
+
+impl Observer for TimeObserver {
+    fn pre_exec(&mut self) -> Result<(), AflError> {
+        self.last_runtime = None;
+        self.start_time = current_time();
+        Ok(())
+    }
+
+    fn post_exec(&mut self) -> Result<(), AflError> {
+        self.last_runtime = Some(current_time() - self.start_time);
+        Ok(())
+    }
+}
+
+impl Named for TimeObserver {
+    fn name(&self) -> &str {
+        &self.name
+    }
+}
+
 /// A MapObserver observes the static map, as oftentimes used for afl-like coverage information
 pub trait MapObserver<T>: Observer
 where
@@ -163,7 +207,7 @@ where
     T: Default + Copy + 'static + serde::Serialize + serde::de::DeserializeOwned,
 {
     #[inline]
-    fn reset(&mut self) -> Result<(), AflError> {
+    fn pre_exec(&mut self) -> Result<(), AflError> {
         self.reset_map()
     }
 }
@@ -235,6 +279,7 @@ where
     }
 }
 
+/// Overlooking a variable bitmap
 #[derive(Serialize, Deserialize, Clone, Debug)]
 #[serde(bound = "T: serde::de::DeserializeOwned")]
 pub struct VariableMapObserver<T>
@@ -252,7 +297,7 @@ where
     T: Default + Copy + 'static + serde::Serialize + serde::de::DeserializeOwned,
 {
     #[inline]
-    fn reset(&mut self) -> Result<(), AflError> {
+    fn pre_exec(&mut self) -> Result<(), AflError> {
         self.reset_map()
     }
 }
@@ -340,17 +385,23 @@ where
 #[cfg(test)]
 mod tests {
 
-    use crate::observers::StdMapObserver;
-    use crate::tuples::Named;
+    use crate::{
+        observers::{StdMapObserver, TimeObserver},
+        tuples::{tuple_list, tuple_list_type, Named},
+    };
 
     static mut MAP: [u32; 4] = [0; 4];
 
     #[test]
     fn test_observer_serde() {
-        let obv = StdMapObserver::new("test", unsafe { &mut MAP });
+        let obv = tuple_list!(
+            TimeObserver::new("time"),
+            StdMapObserver::new("map", unsafe { &mut MAP })
+        );
         let vec = postcard::to_allocvec(&obv).unwrap();
         println!("{:?}", vec);
-        let obv2: StdMapObserver<u32> = postcard::from_bytes(&vec).unwrap();
-        assert_eq!(obv.name(), obv2.name());
+        let obv2: tuple_list_type!(TimeObserver, StdMapObserver<u32>) =
+            postcard::from_bytes(&vec).unwrap();
+        assert_eq!(obv.0.name(), obv2.0.name());
     }
 }
diff --git a/afl/src/tuples.rs b/afl/src/tuples.rs
index 4b6dcfa20f..3163ee27f1 100644
--- a/afl/src/tuples.rs
+++ b/afl/src/tuples.rs
@@ -91,7 +91,9 @@ where
     }
 }
 
+/// We need fixed names for many parts of this lib.
 pub trait Named {
+    /// Provide the name of this element.
     fn name(&self) -> &str;
 }