Lol lazy fucker. Jk. I could tell by the end when mine was ripe. Mine was a indica dominant hybrid very strong indica effects. So I wanted to pull not early but not late. So when around 80% of the hairs had turned Orange and were receded, and inspected the bud, not the leaves only the buds and found an average of 90% clouded triches, 5% Amber triches, and 5% clear triches. The high is perfect for me if I smoke enough I'll fall asleep but can smoke throughout the day and stay awake. All depends what yor going for and what the strain is. If you flipped the light New Years it takes about a week or more to start the acual flower time. So you should be done within a week or two. Cause certain things can lengthen the flower period just like what happens to mine