Takes me forever actually, I'm incredibly slow. This 'only' took me like 1 and a half hour because its sloppy and its not colored.
Reasons for this slowness:
1. I do it with the pen tool in photoshop because I found that drawing things on paper and then scanning it in required tons of pen tool clean up afterwards anyway. So I just skip that step completely these days (also, I am too lazy to actually practice basic shapes and such, resulting in me having a pretty unsteady hand and having to use the eraser far more times than is good for the paper)
2. I don't practice on any kind of regular basis... there are often complete months in which I don't draw anything at all. And if I do, its usually something I need for WoD.
tl;dr: I'm a lazy and bad 'artist' and I need to practice/learn more