Due to not having much time to draw this one took much longer than it would have normally. The picture got somewhat beaten up along the way, but the scan didn't emphasize the smudges and crinkles in the paper.
As for the question, you mean how much time to draw one of these? This one took probably 3 hours or so in all, mostly trying to think of ways to make those towers in the background interesting. Everything in the foreground took roughly a half-hour or so. That's overall work put into it though, it was spread out through several days as I tried to find time to draw.
Most of my drawings take 2 to 3 hours to draw if they're more complicated ones. The one that took the most time to draw was Land of Misfit Toys due mostly in part to how much time it took to fill in the black parts.