Never really saw an answer, so I'll toss one in..

From FAQ: "215s - 7% ROI" expected for solid multitable performance.

ROI*(BuyIn) = expected return per game = epg
Annual/epg = games required for annual = G/yr
then divide that by 52 (or 50, for a couple weeks off) for a games/week or whatever, so

7%*215 = 15.5 epg
100,000/15.5 = 6645 games/yr
6645/50 = 133 games/week

or if you're pessimistic (like me):
5% ROI => 186 g/wk
3% ROI => 310 g/wk
So, 50/day should be enough.
<sarcasm>
but, without knowing the ROI, who knows. Despite the shape of the curve defined by those 3 points, playing infinite games will yield no profit from negative ROI.
</sarcasm>