If you’re on top of your game and use fast 60 day strains, it’s about 60-70 days for the total process including 3 days of drying in the cabinet, so you can get 5 grows per year. Of course if you have a gap in between grows (vacations, etc.) or whatnot, then maybe 4.  We keep ours humming non-stop with maybe a day of downtime in between, and get 5 per year.  Theoretically you could squeeze 6 but that’s super super aggressive.  We have been getting 5 full harvests and maybe we're a few weeks into the next one when the calendar flips.