I've been writing one night a week - four times out of five on a Friday - regularly since mid-1995. (cenwolf, if that's before you were alive, i shall feel old. I was halfway through my PhD at that point.)
Since which point I have; written 450,000 words of a Christian-mythos fantasy novel that's probably unsellable because of how pre-9/11 its world is, which I would probably split into a trilogy, and would count as "finished" bar a revision pass on the last 50kwords, but it's hard to make motivate myself to do that; written a lost-colony-world novel; written four-and-a-bit novels* and one short story in wildly different corners and periods of an SF future ranging from the 2030s to 28,000 AD (there are three more planned for that setting, the latest one being three million years in the future); written chunks of two fantasy novels; and most recently written two more space operas** in a New! Shiny! Universe! in which I think I have closely-linked series material for several more novels.
*This includes the book I refer to as The Thing I Should Be Working On.
**This includes the book I refer to as The Thing I Want To Work On.