Well, I know it's possible at 50nl, and I think it may even be possible at 25nl (with enough hands?).. $2k is my goal for August at 50nl.

There way I have it figured is:

At 3.5ptbb/100 (a little less than what I beat 25nl for) that's $3.5/100 hands. So let's assume you play 10-12 tables for approximately 680ish hands per hour. That's $3.5 * 6.8 = $23.80 per hour. So you would need to play around 85 hours per month, which is quite doable ($2023). However, I did just make all this up on the spot. It's not really my plan exactly, but I haven't quite worked mine out yet so. Just wanted to show that it is possible without 20 tabling or even playing hundreds of hours a month.

Also, this is also with rakeback or bonues etc.