Thanks! The Bulba ones were quickies, so less than an hour each, I'm guessing. The Charizard one took me a bit longer, I did a sketch for it on Friday, and then inked, scanned, and coloured it yesterday. A few hours there definitely. I don't know exactly how much though...
@gameboy (I hope you do not mind me calling you this): NO OBESASAUR IS SAMOAN, HOW INSENSITIVE!

Hahaha, just kidding. Yeah, probably American.