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This is an approach I support. Go hard until you can't, then don't. My last TD I went into it with 10 days straight of no more than 5 hours of sleep per night. I hit a (proverbial) wall 3/4 of the way through the second to last session. Then when we were in the classroom session I nodded off a few times. Needless to say I opted not to go out for the last session. Way too much at stake out there to go after it when you're not sharp.