It also depends on the casino and whether it's a cashgame or tournament. In cashgames nobody really cares - at least around here (the two biggest card casinos in europe). It usually is tolerated until someone objects. If he throws the cards in the muck face up, it's definitely a fold, and the dealer should just give you the chips and deal the next hand.
You can alway call "time". After that he has exactly one minute left to act until his hand is declared dead.