If you started from seed and it is just a baby sprout, you need to keep it moist all the time.. A couple tablespoons of water a day at least. After 14-21 days it should have some roots established... that go deeper than 3 inches... then you should water only when the top 2-3 inches are dry ... then you use the soak ... and dry system.... if a seedling drys out, it will DIE! yikes

also depends on how hot it is.. but like I said, a baby needs to always be moist....