Well by the looks of her, she'll need at least another 4 weeks or more:
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I watered her after taking this photo this morning. She was thirsty and took 5 gallons of water without a drop of runoff. Oops? She can supply her own nutrients, but she's still dependent on me for water! With as little as 4 weeks to go, it's time to start thinking about a cover crop. I try and time my cover crop seeding so that the plant only has about 2 weeks left. That's coincides with when I do a last defoliation to expose the lower buds to more light, while allowing more light to reach the soil so that my cover crop doesn't sprout in darkness. By the time this girl is 100% harvested, the cover should be well established so that the soil always has living roots in it. Any nitrogen continually mineralized that goes unused by the plant during late flower will be moped up by the cover as well.
There is a little preparation I'm going to do before planting the cover crop this time around. I think I'll throw in a pound of alfalfa pellets a week before planting. I don't normally do this every cycle, but it's been 3 full grows since I've adding anything external except hay or straw (mulch). I'm also going to add a little azomite to raise the mineral content of my mix and for worm grit, and some bentonite clay (calcium) over top a day before seeding the cover in a couple weeks.
This is what the underneath of the plant looks like now:
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I partly base my 4 to 5 week estimate on the look of the whole plant. She's still not killing off any of the old lower fans that have been in darkness for weeks. Plus I'm hoping the colas get 3 times fatter over the coming weeks. lol After the trouble of training this plant with the extended veg, if she doesn't yield as expected I'll be a little disappointed. I'm looking forward to getting 4 Bubba Kush 2.0 seeds in there. Back to "easy" growing for me.