Not sure if this helps but two weeks is the standard time amount of time you want to flush your plants for from what i've been told about hydroponics. When i tryed the hydroponics out i slowly build up the nutes from veggie to flower then slowly ween em off then poof cut em off for last 3 weeks but that's just me. i wouldn't chance it with two weeks. In soil i just put some wormcastings and a little flower power for P&K and i most likely won't have to ever add anything or worry about flushing because the nutes will have been eaten up. My standard grow cycle goes from 2-3 months veg and flower combined. I think the key point you should tell yourself is how much food do they really need, but i'm just a novice grower so get more opinions. that's my thesis hope is helped lol