Green Ending with a lot of silly mistakes like shooting extra shots, not pressing " talk" when I should had and so on. However, after coming back from a long hiatus with a new strategy and new duplication glitch found by me, I was able to cut 10 seconds off last run for the sub 21 minutes.

The new strategy revolves around talking to Chie for the +150 Sane Mental Health for the Psych report at the end so that I was able to kill two thinman as where I didn't kill any on the last run and had to do some shenanigans to skip a few of them. Each thinman kill nets a +66 Psycho which means +132 Psycho Mental Health in total for both of them while adding and extra +110 Psycho for shooting Mother in the head 11 times (and a few more due to every shot which doesn't amount to that much).

I tested this route by killing 3 thinman which meant a total of +198 Psycho in total, however, it was too much for the green ending, meaning that this route is in the border of getting blue ending. Maybe if you talked to Benzido for and extra +50 Sane may be able to allow you to kill a third thinman, but there really isn't any more thinman that took that much time asides from the one on the generator key room, however, I use the waiting time in that spot to heal and reserve my last bullet for the fatman so that I recharge my weapon while I was already using it.