Ive found about a 10-20% gain in weight on harvesting from the top down in 3 waves over 4 weeks, most all the lowers harden up and pack on a very noticeable size increase. The real question is that extra time it takes for the 10-20% gain worth the time in your flower room. How i gage it is if i have plants ready to go in the flower room harvest fast, if my veg isnt quite there harvest over time. Harvesting a plant over a few weeks has a few good thing that happen, extra weight, better quilty lower buds, but one of the best imo is sampling the meds at differnt thc ripeness, this will truly show you the effects a few days have. One thing to watch for is the finger hash not being sticky once this happens ya went too far and will lose some smell and the meds will make you want to sleep.