So you just chop the plant at the base of the stem and leave the roots in the pot, still in the soil and just plant again? No time between grows?
Yep, just leave the roots there. If you have good enough biological activity, you should be able to easily twist out the main stock within a week or so. If not, just cut it out a few inches below the top of the soil.
How soon you replant kind of depends on how you're replanting. Are you gonna use clones, are you gonna direct plant, are you running autos or photos,.............. et cetera.
Once I get this style going, I think one of the things that will aid in the turn around, is maintaining a good living cover crop toward the end of your grow of your girls. Naturally when you chop you're going to turn off your water. A vigorous cover crop will take up all that moisture that you have. Once the cover crop has pulled out the excess moisture, you can chop and drop the cover crop, throw a little bokashi on top, let that work for a few days and then throw a layer of compost with any other top dressing amendments you want to do and then replant your cover crop. You can then plant your girl at that time.
That's an easy two weeks before you replant with minimal amount of labor. Now weigh that against taking all the material out of the pot and placing it into a tote, adding all your reamendments and letting them cook for three weeks, or until it stops heating back up after turning. I monitor the temperatures in my tote that's cooking the next runs media and I turn it a day or so after I noticed the temperatures begin to drop, so ya got to add all that labor too. Then you have to repot.
You should be able to keep that going for quite a few rounds of growing. I think the Living cover crop is a must with this particular set up to help keep the upper layer more fluffy and permeable. It also helps hold moisture in the upper level where are you going to have a lot of biological activity.
It's sorta like a modified Ruth Stout style of growing.