bump e2e waiting timeout

test/e2e/runner/wait.go

@@ -30,5 +30,5 @@ func WaitUntil(testnet *e2e.Testnet, height int64) error {
 // waitingTime estimates how long it should take for a node to reach the height.
 // More nodes in a network implies we may expect a slower network and may have to wait longer.
 func waitingTime(nodes int) time.Duration {
-	return time.Duration(20+(nodes*2)) * time.Second
+	return time.Duration(20+(nodes*4)) * time.Second
 }