By and large most work on a 4 weekly cycle with domestic work.
Commercial work will vary, shops can be a couple of times a week (Woolies is (or used to be) 3 times a week) the big stuff might only be once or twice a year.
Cycle it on a 4 weekly basis if you can, various customers will want different things, but 4 weekly is a good base to start off with.
Ian