It depends on what media you're going to use. Clay pebbles? Coco? Rock wool? That will be a huge part in how often you flood. How long? Depends on the pump you decide to go with, how big the table etc. Ideally you want a fairly quick flood as well as drain time. The more often you can flood usually the better, so I choose a media that dries fairly quickly, clay pebbles.
What is your general setup going to be? I love flood and drain and I think I can help show you the way. Just need more info