The one I probably spent the most time on here on DA was a dragon I reworked from Terada Katsuya. It's a dragon and it took 5 hours, which was the same as the Joe Mad refiguring I also did. I say "reworking" because I didn't copy it exactly, but added to it. Didn't even get to finish the dragon. They're the longest I spent so far, but I've spent many collective hours on other stuff, just not on one drawing. How long did you spend on this one?