When Should I Flush My Nutes?

My problem is this. I have a really sativa dominant strain...NYCD so I am told. I turned them eight weeks ago to the day. I have been looking at this link about when to harvest.

http://www.420magazine.com/forums/harvest-preparation-curing/79156-pictures-when-harvest-trichome-colours.html

...and I know that I want to harvest when the trichomes are mostly cloudy. My trichomes are just now starting to turn cloudy

So finally to my question: How long will it take for the trichomes to become mostly cloudy so that I can know when to start flushing my nutes for a good two week period before harvest.

flush 2 weeks before harvest

Right. I get that. What I am trying to find out is roughly when the harvest will be......based upon the 'just starting to turn cloudy' status of my trichomes.

Should I start flushing now? or is 'just starting to turn cloudy' to soon to start flushing.

if you got mostly cloudy flush now

alright, thanks