2 weeks. holy shit. do you hammer the nutes in your plants? flushing just robs your plants nut uptake and forces them to live on just water alone. can you live on water alone for 2 weeks. I flushed only for 1st harvest and haven't done so in 6 or so more harvests since then. I cant tell a difference, nor can my 4 other patients I grow for (legally). I do give water only as soon as I see the first amber trich, thru harvest (which is about a weeks time). I chop 4-6 days after seeing the amber trich(s).
most growers are 50/50 on weather or not flushing is needed.