Depends on reservoir capacity, water quality, nutrients used, system type.
I have 4x8 trays on 160 gallons that run for 60 - 90 days with only topoffs and addbacks with pH monitoring. Last 5 weeks I just addback PK.
Use a 50ft long piece of poly tube from the hardware store. Should be 1/4" but check. The pressure will have no problems getting the drainage that far.
Using one 10kbth/hr unit may be a little more energy efficient, two 5kbtu/hr units offers other advantages.
Set one two degrees higher and they run in stages. Say one is at 77 and other kicks in at 79 if the one unit can't keep up.
The legal protection is a significant factor imho. Law enforcement has much greater respect for medical grows.
I would get a red card plant count of say 15 and have seven flowering and seven veg.
So, I've spoken to a few of the more reputable prescribing physicians out here in Colorado. They are still handing out high plant counts.
They tell patients "If you get a letter from the state to call them." They say that a copy of this letter is sent to them. What the letter would say...
That's true hermaphrodism there. Not bananas but actual pollen sac clusters. I note a few pollen sacs were open so you likely have some seeds in the making.
When canopy based instead of plant count based restrictions apply, growing many smaller plants with minimal veg time results in higher yearly production totals.
Sea of Green for canopy grows in Washington.
Actually I stand corrected. The newer models advertise use with lower wattage lamps.
The previous models did not.
I learned something. Wish I could +rep you.