A couple of years ago there was an american magician, who willingly had his body boxed in ice for days on end. Pedestians would walk on the pavement watching him inside the ice, and wondering - Why?
He survived, but did not manage to controle his own legs, when finally free. He said, he did this attempt of a record to show how one can surviove using the method of meditation. Rather foolish in my opinion.
There are many records to be broken, but 41 hours inside a small box in a lift, not my cup of tea at all. I guess if you need to stop smoking and you have tried every other method, not succeeding, it could come in handy