update clock to time calc

libafl_qemu/src/clock.rs

@@ -145,7 +145,6 @@ impl Default for QemuClockObserver {
 //========== Feedback
 /// Nop feedback that annotates execution time in the new testcase, if any
 /// for this Feedback, the testcase is never interesting (use with an OR)
-/// It decides, if the given [`ClockObserver`] value of a run is interesting.
 #[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct ClockFeedback {
     exec_time: Option<u64>,
@@ -179,7 +178,7 @@ where
     #[inline]
     fn append_metadata(&mut self, _state: &mut S, testcase: &mut Testcase<I>) -> Result<(), Error> {
         *testcase.exec_time_mut() = match self.exec_time {
-            Some(s) => Some(Duration::new(0,360*s as u32)),
+            Some(s) => Some(Duration::from_nanos(s << 3)),    //emulated time is << 3, real time more like * 360
             None => None,
         };
         self.exec_time = None;