1. I allways draw till I have no idea's anymore...If I start, I make other versions of the first drawing and then another version and that till I think it is ok...and then next idea...till my head is free again...so sometimes I 'have to' draw...
2. sometimes I don't draw and sometimes for like 2 or 3 hours or even longer...
3. depends on what I make...a 'nice' car takes between 1 or 2 hours. And a simple sketch takes less than 20 minutes...