If it's between a 1/2Z and a Z a plant every 10 weeks or 5 harvests a year in SOG mode.
I haven't used the box but plan to buy one, but seems to me there is a way to do more harvests with the box.
By using the veg chamber right, and always have clones already cutted AND rooted when you harvest, you can keep non-stop flowering.
With a 600w enchanced (added blue and violet spectrum) HPS and proper nutrients, it is possible to harvest some strains much faster.
AK47-AK48 from Nirvana can flower fully in 48 days (7 weeks). So that's 7.6 harvests per year. Let's say 7 with maintenance and vacations.
M39 is a canadian commercial, indica strain, cross between skunk and some dutsch. It is used becaused it flowers very fast, in 39 days the fastest, and produce decent bud (this is a bit-better than normal dealer pot), and can be quite decent if grown with a bloombox and optimal parameters.
Even if we calculate 42 days flowering, that's 8 harvests a year, even with maintenance and downtime.
Average yields for an bloombox cycle are about 0.5-1lbs from the manufacturer. I've seen people get 7-8oz dry from 4 plants first try.
I think 0.5oz-1oz from a plant it too low. But let's assume 1oz still, with 8 good plants that comes to 8oz a harvest, the 0.5 lbs lower range from the manufacturer. I'm sure a good grower with a great, productive strain could go higher.
With a fast commercial strain, 8 harvests, at the minimum 0.5lb a harvest, that's 4lbs a year.
At your 300/oz price, including rebates for big sells, expendibles, lamps and maintenance, that comes to
4 * 28 * 300 = 33600$. A year, with fast, commercial bud, and putting already rooted and vegged a bit clones immediately after each harvest.
I think the number could go up, since 0.5lbs per harvest could be improved with the faster, most massive indica you can find.
I think it would go down though, as selling 400/oz is too much if you have big quantitites and dont want to spend your time dealing. Just sell it 300/oz, minimum 1 pound.
I'm not sure the people around here have explored the quick harvesting properties of the bloombox. We see people's journals and their first grow, big sativas or choice hybrids, but with fast commercial indica that flowers really in 6 weeks you can do 8 harvests a year for big production.