Thread:Prodigy X/@comment-4992373-20131005080258/@comment-4992373-20131023183823

Jinzen -> A meditative stance that forces one to enter their inner world. Through this stance the shinigami can train against their zanpaktou in order to understand it more and possibly develop/unlock techniques.

The Kaikyo Kotei, a technique to stop the walls in the Dangai from melting. When the walls begin to melt, it can possibly touch someone and if it does it would stop any soul from moving (Obviously Aizen might be an exception because he wasn't ordinary anymore).

Kōtotsu which is the "Sweeper" within the Dangai, appearing every 7 days in Soul Society. Because Aizen destroyed Kototsu, Isshin only had to worry about the walls of the Dangai and thus used "Kaikyo Kotei" in order to allow ichigo to train within a "Hyperbolic time chamber"

1 hour = 2,000 hours within the Dangai

2 hours = 4,000 hours within the Dangai.

It hasn't been stated if Kototsu has reformed or not in the manga but I'll assume it has otherwise hollows would be attacking Soul Society by now. Kototsu has shown to have bones which seem to hint that it was made by someone.

So I guess if someone killed the Kototsu it would obviously take it more then 7 days to regenerate or be replaced ; as seven days = 168 hours.

So 2000 hours = 77 1/2 days in the Dangai. So 2 months you can train within the Dangai, for up to 1 hour in Soul Society and the human world, if you can take care of the Walls and The Sweeper.