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.
If you want a small, fast plant and get a big strain, or vice versa, you're probably not going to be happy with your results. These two auto-flowering plants are both 70 days old and grown in the same environment, but they are different strains. One strain stayed small while the other strain got a lot larger.