Try to water to saturation when you do water. There is no advantage to watering short of saturation. It will in fact lead to salt accumulation in the soil over time.
The thing to watch with the watering is not so much the precise amount (which generally should be enough to get the soil properly saturated, so that water comes out the holes in the bottom) but the frequency.
After you have watered well, make sure the pot does not sit in standing water. Then try to track how much moisture is in the soil from that point forward, and wait to water until the soil is going dry. It will dry out at the surface much sooner than it dries out at depth (which is what matters) so you might need to stick your finger or a bamboo chopstick in there to figure out what's happening underground.
The actual interval might be every week or every 2 weeks, probably closer to the latter indoors, but the only way to know for sure is to observe what's happening. You will find you need to water more frequently when it is hot and dry, and less frequently when it is cool and cloudy. More often in the summer, less often in the winter, as a general rule.
Good light will help with the watering and guard against the potential dangers of overwatering (rot). Using soil with some perlite or pumice (or whatever) mixed in, to say 25-50%, will also help guard against overwatering. Air in the soil is generally your friend. A mix that stays soggy is going to be problematic.
