14 days then i would go 12/12 but that size screen could be 50% full in the next 7 days.When trimming the leaves under the screen(lollipopping) I cut leaves i bit at a time then take the leave stem of with a stanley blade doing a differant plant each day until you are back to the first plant this gives the plants a break before being trimmed again.hope it all works out.the postman.