You've got a long time.
don't flush. keep it healthy. go watch teh 29min video of the migrow guy on youtube interviewing a couple PhD's that applied the scientific method to this urban myth and the results were not flattering. It doesn't impact mineral content of buds, and blind taste test showed ppl had no fucking clue what was flushed and what was not flushed.
Flushing is a dramatic thing to a plant. you should only do it in the face of utter catastrophe, otherwise it's just going to slow down growth compared to not doing it. if your pH is out of control or your nutrient content of soil is disasterous, then it's a good time to flush and try to reset things. it's an extreme measure with its own negative repercussions. it's wise to only do it when absolutely necessary. like being trapped on a mountain side... you don't start eating people until you are dying of starvation, lol... don't flush without good cause. it is detrimental to the plant.
if you sap the ability to perform photosynthesis efficiently, then you sap what powers all of growth.. keep that canopy strong.