a node is the area where a branch emerges, branches start out straight across from each other, as the plant matures the nodes start to alternate,this is a sign of maturity.

looking at the trich development is a perfect way to know when to harvest, they look like a lollypop ,a ball on a stick, the ball changes from clear ( light heady high) to cloudy ,then they start to turn amber (more couch lock high) alot of people like a 80% cloudy and 20% amber.

it takes 45 to 120 days to finish flowering, I would say 65 to 90 is average.