The first very important piece of knowledge that a grower must understand is that it is light intensity that drives plant transpiration. The light energy impinges on the plants leaves and warms them. The leaves respond by opening their stomata exposing water to the atmosphere and this evaporates and cools the plant. If the sun is too intense and the plant cannot provide enough water to the leaves then wilt will occur.

For general irrigation time and length using a timer, start out with (3) irrigation's per day, 15 minutes per irrigation. Make adjustments off of that as needed depending on plant transpiration (light intensity).