How long will thay grow?

take about 8 months to start flowering if you're using a grow light. another year to flower fully after that, then you have to cure it for 4-8 months.
 
just kidding, normally from 8-10 weeks, depends heavily and primarily on the strain you have, so if you don't know you'll have to check by the trichomes and harvest when you think is best
 
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