Every week, except for the week after I cook, I'm given a duty I have to do Monday-Saturday (or Sunday). In our kitchen, there's bathroom duty, then cleaning the computer and recycling rooms, and the maid duty (kitchen cleaning duty), then cook (cooking the food for our kitchen for a week). Most duties take twenty minutes at the most, minus cooking, which takes hours. On Friday or Saturday, I also do a weekend duty, which is more intense cleaning.
I don't get paid, per se; I don't see any cash from it, but I only pay half of what other dorm students pay because I do chores. That's the beauty of living in a cooperative dorm. :)