In-game timers that make you arbitrarily wait for something.
"You have to wait from as little as minutes to as much as days to complete tasks, earn in-game currency, and to get phone fling responses."
"There's this feature called Duels where the equipment you fight with is random and it makes you wait for 4 hours but only if you win. If you lose you can keep playing. This might compel you to keep playing until you win. You can still access the rest of the game, when you win."
"Each in-game day lasts a couple of minutes, with automatic pausing in menus, giving you unlimited time to decide what you want to do. But sometimes you do have to just wait for time to tick by to get to the start time of a race, or wait for the end of the day when you've done everything you want."