Am I right? If it says 65 (read 90+) days, the first day is when she starts to flower.
Correct but it’s just an estimate
I start counting flowering time 2 weeks after i flip. I consider the first 2 weeks a transition. The guesstimated guide help you in length of time but your trichs will tell the true tale of when to flush & harvest.
If growing outdoors, you give up control of the growth process to the sun. A plant may flower for 6+ months. Indoor growing makes it easy to start flower when YOU want .
Grow and flowering length posted on the seed descriptions are “just estimates”…you results may vary.