Answer: 20 to 80 years!
This, in part, is why hemp is considered an attractive alternative for paper-making. It is an herbaceous annual plant with a single, straight un-branched hollow stem that grows over a 4-5 month growing season to a height of 3-16 ft (1-5 meters). So theoretically 1 acre of hemp can produce as much paper as 4-10 acres of trees over a 20-year cycle!
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