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Sounds amazing. I can't figure out if this would be great for my ADHD or similar to CIA torture.

It would be both. 10 days of doing anything intensively is a LONG time!

The author did say that several people couldn't last. I'm sure you would either crack or have a breakthrough...

It would be great for ADHD stuff. As I mentioned in a comment above, it gave me amazing clarity of thought and stillness.