How many weeks to go?

I would give them another 7-10 days for maximum THC, but if you prefer sleepy couchlock effect, give them another 14-20 days or so. There is no need to drown your plants with gallons of water as a "flush", all you need to do is stop all fertilizers/nutrients/stimulants for the last 10-14 days before harvest and just give plain water in normal amounts and at normal intervals and the plant will flush itself naturally. Drowning the plant does not make the plant take in extra water or make things happen faster, transpiration of waste products is a fixed occurrence dependant on environmental factors such as temps and humidity and air exchange, being hyper washed with water does not make it more effective.