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7 days. I'm not in the money lending business. If you're late, I'll send you an angry owl picture (cute and worked well so far), or if I think you'll get it, a video clip of Malcolm Reynolds saying "I do the job, and then I get paid" (sorry, too slow internet to look that one up on youtube for you).

If a client is regularly very late, I send a more serious email and if they can't get a grip on it, I dump them.

So far I've never not gotten paid and only ever dumped one client who was a pain in the ass in many other ways too.

Oh, forgot to mention, I invoice weekly.