To be fair, I can't tell you precisely how much this one took me because I've been working on several drawings simultaneously. At least 5-6 hours, I guess. Probably more, because I get easily distracted.
As for the media - as always, it's a mixture of traditional and digital methods. The linework is drawn with a pencil, I also painted the smoke in the background on a separate sheet of paper. I scanned everything afterwards and had fun with it on the computer (inverted the colours in certain parts, for example).