Yeah, sometimes when death is near, time does slow down a lot and seems like 1 minute is suddenly like an hour, an hour is many hours, etc. I could recall there has been several times where I come to a critical point in which I'm close to death. Things really slow down and I guess it's my body and mind reacting to the possibililty of death coming.
I don't know, but maybe try to not over stress yourself during this time and do what you can to suppress your survival instinct so you aren't likely to back out at the last moment.