Try watering once a week for starters, maybe less often. I water my indoor plants (SW exposure, lots of sun) once a week but they are in a mix that's half pumice. Ideally time your watering cycle based on when the soil goes dry (at depth). When the soil is dry, it's time to water. Before then, best to exercise restraint, for the health of your succulents. It's easier to kill them by overwatering than underwatering, at least the result occurs a whole lot faster.
