1/30 of your guarantee for the month for every day. The best way to maximize your money is to work on your days off and don't put in mil leave. Obviously a flexible Reserve unit is easier to work with. If you put in mil leave, provide your paperwork (tp's, uta's, orders) so your B fund gets funded for the days you lose.
All of this is how it worked at CAL. I assume it's probably the same now at UAL. Anybody else feel free to correct me if something has changed.