Hard to give any definite answer, because it depends on a bunch of things like how much rain (if any) you get, humidity, heat/sun, how well drained your soil is, what kind of plants you have, etc.
But above is good advice. Basically for seeds I water frequently but not real deep, enough to keep them moist but not wet or waterlogged. Once you have established plants with decent root systems, you want to move towards less frequent, deeper waterings. Stick a finger a couple inches down into the soil. If it is dry that deep, it's time to water.
Adding mulch on top of your beds will help conserve the water.