diff --git a/libafl/src/bolts/tuples.rs b/libafl/src/bolts/tuples.rs
index 41df01bb77..2cd2d51d9e 100644
--- a/libafl/src/bolts/tuples.rs
+++ b/libafl/src/bolts/tuples.rs
@@ -181,6 +181,7 @@ where
     }
 }
 
+#[macro_export]
 macro_rules! tuple_for_each {
     ($fn_name:ident, $trait_name:path, $tuple_name:ident, $body:expr) => {
         mod $fn_name {
@@ -211,6 +212,7 @@ macro_rules! tuple_for_each {
     };
 }
 
+#[macro_export]
 macro_rules! tuple_for_each_mut {
     ($fn_name:ident, $trait_name:path, $tuple_name:ident, $body:expr) => {
         mod $fn_name {
diff --git a/libafl/src/corpus/testcase.rs b/libafl/src/corpus/testcase.rs
index 7dabd96733..d43812d8b3 100644
--- a/libafl/src/corpus/testcase.rs
+++ b/libafl/src/corpus/testcase.rs
@@ -2,7 +2,7 @@
 //! It will contain a respective input, and metadata.
 
 use alloc::string::String;
-use core::{convert::Into, default::Default, option::Option};
+use core::{convert::Into, default::Default, option::Option, time::Duration};
 use serde::{Deserialize, Serialize};
 
 use crate::{
@@ -26,6 +26,8 @@ where
     fitness: u32,
     /// Map of metadatas associated with this testcase
     metadatas: SerdeAnyMap,
+    /// Time needed to execute the input
+    exec_time: Option<Duration>,
 }
 
 /// Impl of a testcase
@@ -141,6 +143,7 @@ where
             filename: None,
             fitness: 0,
             metadatas: SerdeAnyMap::new(),
+            exec_time: None,
         }
     }
 
@@ -152,6 +155,7 @@ where
             filename: Some(filename),
             fitness: 0,
             metadatas: SerdeAnyMap::new(),
+            exec_time: None,
         }
     }
 
@@ -162,6 +166,7 @@ where
             filename: None,
             fitness: 0,
             metadatas: SerdeAnyMap::new(),
+            exec_time: None,
         }
     }
 }
diff --git a/libafl/src/inputs/bytes.rs b/libafl/src/inputs/bytes.rs
index 0726df7de6..b622a002f7 100644
--- a/libafl/src/inputs/bytes.rs
+++ b/libafl/src/inputs/bytes.rs
@@ -5,7 +5,7 @@ use alloc::{borrow::ToOwned, rc::Rc, vec::Vec};
 use core::{cell::RefCell, convert::From};
 use serde::{Deserialize, Serialize};
 
-use crate::inputs::{HasBytesVec, HasTargetBytes, Input, TargetBytes};
+use crate::inputs::{HasBytesVec, HasTargetBytes, HasLen, Input, TargetBytes};
 
 /// A bytes input is the basic input
 #[derive(Serialize, Deserialize, Clone, Debug, Default, PartialEq, Eq)]
@@ -42,6 +42,13 @@ impl HasTargetBytes for BytesInput {
     }
 }
 
+impl HasLen for BytesInput {
+    #[inline]
+    fn len(&self) -> usize {
+        self.bytes.len()
+    }
+}
+
 impl From<Vec<u8>> for BytesInput {
     fn from(bytes: Vec<u8>) -> Self {
         Self::new(bytes)
diff --git a/libafl/src/inputs/mod.rs b/libafl/src/inputs/mod.rs
index 22e1060c30..09a62f698a 100644
--- a/libafl/src/inputs/mod.rs
+++ b/libafl/src/inputs/mod.rs
@@ -33,7 +33,9 @@ pub trait Input: Clone + serde::Serialize + serde::de::DeserializeOwned + Debug
     #[cfg(not(feature = "std"))]
     /// Write this input to the file
     fn to_file<P>(&self, _path: P) -> Result<(), Error>
-where {
+    where
+        P: AsRef<Path>,
+    {
         Err(Error::NotImplemented("Not suppored in no_std".into()))
     }
 
@@ -52,7 +54,9 @@ where {
     /// Write this input to the file
     #[cfg(not(feature = "std"))]
     fn from_file<P>(_path: P) -> Result<Self, Error>
-where {
+    where
+        P: AsRef<Path>,
+    {
         Err(Error::NotImplemented("Not suppored in no_std".into()))
     }
 }
@@ -96,3 +100,10 @@ pub trait HasBytesVec {
     /// The internal bytes map (as mutable borrow)
     fn bytes_mut(&mut self) -> &mut Vec<u8>;
 }
+
+/// Has a length field
+pub trait HasLen {
+    /// The lenght
+    fn len(&self) -> usize;
+}
+