I've been coding in my spare time in and out since I got my first computer. I didn't do it because I wanted to be a good programmer, but because I love creating stuff and programming is the easiest way I know to create stuff. I'm not happy if I'm not creating something.

Also, a few months ago I quit my job and I'm now making a living teaching people what I've learned during my "spare-time". I now have more free time than I could ever imagine, and the notion of spare-time is starting to disapear.