Depends on a few things, plant size, and soil composition, in particular how much perlite is in the soil. Perlite does not absorb much water - its essentially expanded lava rock. Your water cycle should be consistent in that you water when the soil is a certain dryness. You don't want to underwater because your roots will not spread to dry soil. You don't want to over water, because the bottom of the pot will never dry out, preventing oxygen from getting down there, causing all sorts of problems. That's being said, it's better to underwater a little than to over water. Plants are much more robust when they're larger. Small plants in large containers are tricky, and underwatering is often done to prevent the bottom of the container from becoming sour. Like others have said, water a little at first to allow the soil to wet itself evenly. After a few minutes add enough water to get a little drain off. You don't want much drain off because you are washing away nutrients. The amount of water your plant will need will increase as it gets larger. At peak water usage near the end of flowering, I have plants in 5gal containers drinking one gallon per day. I use lots of perlite - makes things easier for me.
