I sell sugar-y carnival-style junk food (slushies, miniature donuts, sno-cones, etc.) at a summertime outdoor marketplace, Monday to Friday. My hours are still settling into a routine, but it's about 35-40 hours a week so far, and will be getting longer days as business picks up.
Certain days of the week are bound to be slow, though; especially in poor weather. I'm writing a novel by hand entirely during working hours when there's nothing left to do and I would not be surprised if I'm finished by the end of the summer. :\