idea of a flush is depriving them of nutirents. 10-14 days flush in soil isn't likely to cause problems. The only tip is to learn from the timing if the canopy dies too fast/too soon.
flush doesn't do anything that people say it does. cells are differentiated for their function. what the plant uss from what you feed it and what it creaters are not just randomly in every tissue in equal abundance, that would be insanity.
does your brain store fat? no, fat cells store fat. when you eat too much, your heart doesn't turn to hamburger.
that stuff is stored in leaves, not buds. buds are for sexual reproduction. Several studies have shown mineral contentn does not rise if you do not flush... the buds remain unchanged.
Now, if you have a toxicity or lockout or... some other self-inflicted issue, then a reason to flush becomes more of a feasible action. The less green in your plant, the slower it ripens... no reason to slow it down if not overfed.
I err on side of a small fade at end just to be sure. It's not because i think it improves taste or removes "chemicals" form the buds, because that is absolute urban myth made up by people that have never taken a biology class in their lives.