Simultaneous turn in a turn-based strategy game.

Basically, all questions are resolved by stating the price, presumably something like this:
A good developer (it's pointless to work with others on this) costs 1.2-1.5k rubles/hour.
A small request takes 10-15 hours of work,
A medium request takes 50-100 hours,
And large changes take from 200 hours,
Global changes, like those for a new faction, take even more...