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That has a lot to do with how you want your plant to look . At this point it may be to late to just trim off some of the branches as that will cause lots of stress to your plant and slow down growth , possibly even stunt it or turn it hermie . I would say that 20 branches is too much because some of the canopy will be to thick and some of the lower branches may not get the light they need to fully form the flowers .Usually when growing you would remove the lower branches on the plant in order to try and achieve and even canopy so that you are ensured all your tops are getting the same light and grow evenly . At the end of the day tho its up to you on how you want your plants to look and grow . I hope this information helps you understand the choices you have and the proper time to remove lower branches on your plant . -Happy Growing!