I'm a professional, but my working week varies dramatically as I've been doing mercenary work. Generally speaking, I've been doing a forty hour working week and recently no hobbyist work. When I do do hobbyist stuff, it gets between six and twenty hours.
I've worked on quite a few games (professional and hobby) over the past ten or so years, though I don't tend to give an actual number as 'shipped', as that implies always working on them for the bulk of the development cycle, which isn't always the case.