Probably the closest I've ever gotten to speed painting. If I hadn't had to redo the face, it would have probably been a couple of hours, tops.
This is from the 1/2 Prince manga. It's NOT my lineart, just my coloring, mostly for practice. Yes, the chara is a boy (mwhahaha, I love bafflers). The manga is quite wonderful, I'd definitely recommend it.
As for the painting job here - the eyes are really the only thing I'm happy with *fail*
Lineart & Chara (c) Choi Hong Chong and Yu Wo
Original Lineart: [link]