Some of the best work I've got has been picked up from working on a Sat and Sun. A lot of people who work Mon to Fri never get a chance to ask a window cleaner to do their windows because generally they never see one.
I also do some commercial work in the evenings and I'm amazed at how many jobs I've now got next to shop fronts, etc, that I do on the same evening evening as the commercial work but every 4 or 8 weeks, etc. In one place where I do a shop front, signage etc, every 2 weeks, I have 5 four weekly easy terraced house fronts within 7 houses distance, all done in the the evening at £15 a shot.
I tend to take time off during the week instead, or if I feel like because I enjoy what I do, I just work the whole week as well but there again, I've no kids. They've flown the nest.
Anyway, I get time off when the weather is she-ite like tomorrow will be.