don't worry about any of that nonsense the new2diz is saying...
pot them in gradually larger pots,...usually cuttings start off in 2x2x2" pots, then I move them to 4x4x4" and usually finish clones in a 1 or 2 gallon pot, depending on the strain. If you're giving them a good amount of water and then need another watering that day, probably out grown their pots, but I subscribe to the law that the plants should be somewhat crowded in their current pot before you pot up, helps promote shorter internode distance, imo with every plant I've worked with, house plants, bonsia trees, cannabis.