hey thanks for the reps,Like others said learn to check the trichs. One of the biggest mistakes I made when I started was thinking I could count the days by what a seedbank said. Remember they make that statement based on ideal conditions, which most people don't have especially when they start out.
this is actually because it takes several days up to 2-3 weeks for certain strains to build up the levels of hormones that actually begin flowering, which is when the count begins now personally i always check the trichomes but if its not supposed to be rip until 49-59 days or something, i wont start checking until day 48-49I count as soon as I flip to 12/12, BUT, I think you'll find that the estimated times are rarely accurate, you can almost always add a week or two. The estimates given, are for people running fine-tuned setups, with zero problems, running high-powered lighting, etc...for the fastest flowering times. Every deviance from the ideal, will add to your flowering time.