Phew! That took a lot to finish. Well, I'm the one to blame - nine sketches including one with three characters despite commissioner paid just for one, but I thought the idea was neat, so I included the sketch with kobold fight too, and they chosen it. Then standard process - lines, colros, shading, lighting, background (technically I should include background in lines stage, so it wouldn't look as stylistically different from the characters). Didn't have the timer open, but it took something about 9-10hours, I think?
Given this month's sale rates I just made 50 cents/hour with my art :)