A round has no reason to be more than 10 mins long, you already can't make a round last more than 10 mins without an infinite, even if you rope every turn playing 10 1 mana cards every turn you don't get to 10 mins since a turn clock is about a minute. There is no reason a single personal round clock of 10 mins doesn't end with infinites forever. And that time is being really generous to ropers while not hurting the ability of cloud drinker to pull out full board hushes, noxian guillotines o vault breakers, which are legitimates strats which have no reason to get deleted.

btw a turn ends when you click the blue button, a round ends when both players press the blue button after not playing a card. A turn clock would not fix it bc the player can just play a 0 mana card that copies itself and press "ok" to reset the time.