I made a rough sketch of a fictional creature, scanned it and painted it as quickly and efficiently as I could manage without affecting quality too much. I used the Camtasia recorder to record a video. It lasts about 14 and a half minutes at 10x speed, so I spent approximately 2 and a half hours painting (this includes details, finishing touches and texturing work).
The full video is not up for download, since it is a whopping 70 megabytes in size. If you're curious, send me an email and I'll get you the video.
You can, however, catch a glimpse of the way I paint in these two excerpts (zipped, about 6 Mb).
To watch it, you will need the TSCC (Techsmith Codec).
I really should do this more often, and preferrably with a few smaller projects, to get some nice vids.