Most Facebook games make you pay if you're having too much fun. Or they make you wait. Or they require you to bug your friends. The question is simply: how long will the game wait before it smacks me with this roadblock?
Bubble Safari, the newest game from Zynga and the latest in a ton of bubble-shooting Bust-a-Move-inspired games thriving on Facebook right now, took 41 minutes, 31 seconds to get to that point. I played it that long without hitting those snags. Last fall, the first game I timed like this, Mafia Wars 2, took 39:30 to get to that point.