[bbartlog]

I still don't have enough hands for the BB/100 to be stable at a given level (80K hands but no more than 25K at any given level). Overall 2BB/100, 2BB/100 at 0.25, -0.5BB/100 at 0.50, 8BB/100 at $1 ([img]/images/graemlins/cool.gif[/img]), loser at $2, winner at $4 (over only a few hands at those levels...). The 0.25 winrate is shameful; I used to beat that game at 11BB/100 (for like the first 15K hands I played it) and then ran like ice for 10K hands.
I don't know about hands per month. It's taken me a year to play 80K hands, but I never play more than 3 tables, and only a few hours in a day. Davebreal has shown some graphs that show 80K hands in a month, but he multitables a lot.
As for attainable winrate, I have no idea - but I would assume that there is an inverse relationship between number of hands played and winrate, for various reasons. I do think a strong player could clear 10BB/100 at the $0.25 game or 6BB/100 at the $1 game, but for higher limits I have no idea. My winrate is certainly not representative of what's possible; I'd guess I'm only around the 85-90th percentile (skillwise) of cash game players at the levels I usually play.