Depends on alot of stuff temp,soil used,etc. I would say every 2-3 days, go by when its dry about 3-4 inches down from the top of the soil. You can go by when the soil is dry and the leaves will start to droop downward.
You dont wanna overwater, so be carefull with that. You want good root growth so make the roots look for the water, anotherwards let it dry out before you water again, promotes healthy root growth.