Well, when you have a RTS/strategy/sim game, sometimes you have breaks, especially if you need to build up your base:
You don't have enough resources to build new stuff, the ordered stuff is still under constructed, no enemy attacks and you don't have enough power to attack the enemy either.
What do you do in the meantime ?
There's just one important resource left, the time the player could use to do something meaningful. So , what ways exist to put the player time
to some use. It should be important, that the action should be optional and not mandatory to progress in the game.
A pretty cool example is dungeon keeper 1/2, where the game entities interact with the world on their own, but
the player has the option to speed it up by placing creature at certain places (e.g. start training now) or to slap them as
temporary speed boost.
Are there other examples to fill in the gaps ?
As player, how to you handle such a situation ? Just wait, check some reports, watch TV, or get mad at the game ?