Here on the Sacramento river, I get by with every 2 days, but that might change durring flower... it really depends on the ground your putting it into, alot of sand here, so high drainage area, I'd assume if the soil had a high clay content, time between would extend. Only 1 in now is a photo, so my hole goes 4x4x3. Hopefully Startin a couple autos in a week or so, those holes will be 5 gallon sized.
Watch the girls, they're really good about letting you know when they need water.