[jruderman]

Waiting by not playing a game is never a "core mechanic" of a game. It's either an excuse for the app to grab your attention (play now to get a bonus) or a way to drive IAP (pay so you don't have to wait).

[calbear81]

I'm thinking of something like a Tamogotchi where you need to take action at specified intervals and push notifications would seem like something I would like as a reminder.

[chipsy]

In VESPER.5 you play one turn per day for a meditative experience.