I'm bad at scheduling and have no sense of time, so saying preciesly how much time I use a week on comic making is a though one.
Short answer is whenever I have time and energy for it.
Long answer is, that I try to work on it at least two days a week, but sitting down and working efficiently is a bit thought, and I go back and forth drawing, watching youtube, drawing, read up on fora, etc. all day, so how many hours I draw is hard to say.
I've starting up at a new place for my internship tomorrow also, and they are very accepting around my comc and say I should use work hours on it, so hopefully I will get more organised in the future
A rough hour guess would be about 4-8 hours a week though.