In a weeks time: maybe 20 hours, give or a take a few. I don't put in a lot of volume, so this is probably around average. Definitely increases if I get free time to play more.
Best prize pool: Probably the 1K GTDs that I play, but it varies with size of field and buy-in. I usually play $2-$5, with shots at higher buy-ins, and focus more the the GTD MTTs, so prize pools are decent sized for the micros.
MTTs.