Chemical Weathering. Chemical weathering takes place in almost all types of rocks. Smaller rocks are more susceptible, however, because they have a greater amount of surface area. Chemical reactions break down the bonds holding the rocks together, causing them to fall apart, forming smaller and smaller pieces.
Autos generally are ready to harvest sooner than photoperiod. Most autos are ready to harvest 65-90 days after being sprouted from seed. Some super autos have been bred to grow very big and can take up to 100 days before harvest.
Approx 70-80% of all reg genetics are recommended to go 8-9 weeks when sold by seedbanks. A lot of this can be marketing, as they are trying to make growers think this is the case and that all can be a quick flip, when in reality, they really need 9-11 weeks to reach that full potential. Most strain will allow you to push them into this 9-11 week period. Sativas can go 11-14.