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.
http://www.greenmanspage.com/guides/begi... A little birdie told me that the time from planting to harvest is usually about three months, with another month to hang dry and cure properly. After planting, it usually doesn't take longer than 2 months to flower and pollinate. No matter when the buds appear, you would not want to harvest before 3 months or so, because after flowering you want to give the plants enough time to maximize potency.