Exactly. Once the Round starts, all I need to do as a convenience, is Post a big white sheet of paper on the wall with a End Time.
Watches these days are pretty inexpensive, and since nearly everyone carries a Cell Phone, Time really isnt a issue. Being able to HEAR that time is called is, and I'm sure most players can appreciate when a Judge responds to their shouted request for a Ruling, just as much as WE appreciate when PLAYERS respond to our request to begin or halt a action when we are addressing a situation and noise gets to be just a little bit elevated, especially without a P.A. System.