diff --git a/example/prependETA/main.go b/example/prependETA/main.go
index f8dd01a..5ed8b54 100644
--- a/example/prependETA/main.go
+++ b/example/prependETA/main.go
@@ -29,7 +29,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 50; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar1.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -44,7 +44,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 100; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar2.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -59,7 +59,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 80; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar3.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -70,3 +70,7 @@
 	// p.AddBar(1) // panic: you cannot reuse p, create new one!
 	fmt.Println("stop")
 }
+
+func sleep(blockSize int) {
+	time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+}
diff --git a/example/prependElapsed/main.go b/example/prependElapsed/main.go
index bc7ee9a..dd95447 100644
--- a/example/prependElapsed/main.go
+++ b/example/prependElapsed/main.go
@@ -28,7 +28,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 50; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar1.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -42,7 +42,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 100; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar2.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -56,7 +56,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 80; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar3.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -67,3 +67,7 @@
 	// p.AddBar(1) // panic: you cannot reuse p, create new one!
 	fmt.Println("stop")
 }
+
+func sleep(blockSize int) {
+	time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+}
diff --git a/example/remove/main.go b/example/remove/main.go
index d47b750..86f3469 100644
--- a/example/remove/main.go
+++ b/example/remove/main.go
@@ -28,7 +28,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 50; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar1.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -42,7 +42,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 100; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar2.Incr(1)
 			if bar2.Current() > 42 && p.RemoveBar(bar2) {
 				break
@@ -59,7 +59,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 80; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar3.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -70,3 +70,7 @@
 	// p.AddBar(2) // panic: you cannot reuse p, create new one!
 	fmt.Println("stop")
 }
+
+func sleep(blockSize int) {
+	time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+}
diff --git a/example/sort/main.go b/example/sort/main.go
index 213e41f..61a3651 100644
--- a/example/sort/main.go
+++ b/example/sort/main.go
@@ -27,7 +27,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 100; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar1.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -41,7 +41,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 60; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar2.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -55,7 +55,7 @@
 		defer wg.Done()
 		blockSize := rand.Intn(maxBlockSize) + 1
 		for i := 0; i < 80; i++ {
-			time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+			sleep(blockSize)
 			bar3.Incr(1)
 			blockSize = rand.Intn(maxBlockSize) + 1
 		}
@@ -73,3 +73,7 @@
 		return fmt.Sprintf("%-7s", str)
 	}
 }
+
+func sleep(blockSize int) {
+	time.Sleep(time.Duration(blockSize) * (50*time.Millisecond + time.Duration(rand.Intn(5*int(time.Millisecond)))))
+}