I try not to count at all. Since I'm not running any sort of perpetual harvest system, and I'm only growing to keep myself in sticky green, I feel like paying too much attention to the dates makes me feel like a little kid counting down until Christmas. I'm sure people will disagree with me, obviously knowing how things are progressing has its advantages, but I can't stand counting the weeks. I plant it, when it reaches maturity I switch it, and when the trichomes say it's time to go, I cut it down. If you intend to be a professional, totally disregard this.