Often not advised due to..
Variability in produced seeds
Time to select out males
Lack of cannabinoid production
Chance at pollinating females unintentionally
Takes about 6-8 weeks to ripen seeds
If you decide to harvest early often the seed quality will be poor and have reduced germination rates.
Endosperm may not be fully developed to provide the embryo enough energy to start.
Link to Lecture Slides: https://drive.google.com/open?id=1zzrjSnaiNCABa_9IUbUGNrJJhJB3XLpI
*Full work cited for “Producing Cannabis Seeds” can be viewed at… https://drive.google.com/open?id=12zqYpw3KsTLKe-hI2Sp1g0xxHJ205_QB