Very good advice there, the only other thing I would add is to watch for the calyxes to swell, they should look like they are about to burst. I would say 1-2 weeks as well. As for flushing, without starting an argument I feel that flushing is only necessary if you have a lot of salt/nutrient build up that you need to correct. Depriving your plants of nutrients during the final push is counter productive, I believe most of the myths people attribute to not flushing are from drying and curing too fast/improperly. I have not flushed my plants pre-harvest for many years now and the only difference I have noticed is higher yield... You can search and find this subject beat to death from both sides haha.