(well, always within reason, if an actor is an hour late we would have long since moved on to other things) - But, in discussion with other folks in LA, where traffic is often a factor that impacts even those who don't cut it close, if we can't start because we we are missing key actors, seems there are many who hold the clock for a short window so we can start with the intended work - especially when the cast is very schmoozy. Of course, if it's more than 10 minutes, we find something else to work on. But if the cast is here and the director is late, clock starts at call.