Let's say your character, or the whole group of characters, wants to build an adobe hut. They have some mud and some summer weather.
There are various stages to this project. Some stages just take patient waiting. Others take effort that can't fail but can exhaust time and energy and resources. Other stages might actually be prone to screw-ups which would make the project slower, or more costly, or maybe even impossible.
Suppose that the hut, if created, is a meaningful and exciting achievement, and thus the players are happy to give it more play time and attention than, for example, a yes/no roll. But suppose also that this game is not actually a game about building huts, and that the players are eager to do other things too.
What's your favorite RPG system for arbitrating the process of hut building?
Or, y'know, if the adobe hut idea is too boring, imagine building a ship or enchanting a cave or raising an army or some other complex undertaking.