I take clones every 3 weeks from my mother. So they have 3 weeks to root and veg a bit before moving them into the flowering cabnet. In my flowering cabnet i have 3 sets of plants. The first set of plants are the ones that are in the 1-3 week of flowering. The second set of plants is the 4-6 week of flowering. The last set of plants is the 7-9 week of flowering. When the last set is done I remove them and put more clones in there place. Simple as that. You just need to keep up on the cloning and have good clones to put in place of the plants you are taking out. The reason I do 9 weeks is because that first week they really aren't flowering. By week 2 they are flowering. So I don't really count that as flowering. Even when I did one plant at a time I never started counting weeks till they were actually flowering. You probably could do 2 week sets so they would only be flowering for 8 weeks, but I never had any luck with that. I could never get my clones to root and start growing in 2 weeks. They would root, but it seemed like they wouldn't start growing for a week or so. So thats another reason i do 3 week intervals.