In-game timers that make you arbitrarily wait for something.
"Greenhouses, inns, brewing potions and unlocking portkeys, all have timers attached to them."
"The items you have to craft to progress all take varying amounts of time, from five minutes up to three hours at my current level."
"It has a tavern to deploy characters on missions for rewards with a timer. This timer can be finished by using in game currency."
"Some quests require a predetermined number of random battles to be fought before the quest can advance."
"Each character has an energy bar which is depleted when they are used. Once the energy bar is depleted, the character cannot be used again until it is replenished which happens over time."
"There are a lot of timers for a lot of territories. All replenish at different rates."