diff --git a/src/timer.rs b/src/timer.rs
index 570dec1..b0c51eb 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -440,7 +440,14 @@ impl Timer {
     }
 
     pub fn get_idle_time(&self) -> i64 {
-        let idle_time = 0;
+        let mut idle_time = 0;
+        let start_idx = (self.timer_tick as usize) & TVR_MASK;
+        for i in start_idx..self.tv1.len() {
+            if !self.tv1[i].borrow().empty() {
+                break;
+            }
+            idle_time += 1;
+        }
         return idle_time;
     }