Weekly Earnings.

[pudley4]

How many hours per week do you average?
What is your current win rate (BB/hr)?

Let's say you win 2 BB/hr playing 2/4 (whether that's 1 table, 3 tables, etc, doesn't matter). That's $8/hr.
Let's also say you can play 15 hours/week. That means on average you'll take in $120/week. (Obviously some weeks you'll win more, some you'll win less.)

The best way to make it work is to only take out your $100/week. If you have a sufficient bankroll, you should be able to take out the $100 even if you have a losing week. If you make more than $100 in a week, the extra will stay in your bankroll as a buffer against the losing weeks.

You can also decrease the fluctuations you see even more by waiting until the end of the month to cash out your ~$450.