Gameobject Wait in Update

Hey guys I'm trying to create a simulation that can run as quickly as possible (so the graphics/display are not as important to me), and I am trying to get a game object to (cleanly) wait for x "seconds" in the update function similar to:

 private void FixedUpdate() {
         ...
         wait(5)
         ....
 }

Where the wait would block for this object alone until the 2 "seconds" are up. I've looked into coroutines and they are not awfully clean.

• Note seconds would not be realtime seconds but loops through fixed update

Thanks!