Death Rate of Grafts Kept Out of the Body for Too Long

I was recently told that if the grafts from a hair transplant were out of the body for more than 4 hours, they died. Is that true?

This was studied in the past. Dr. Bob Limmer did this study and kept one group of grafts out of the body for up to 8 hours (studied them each hour for growth), and then studied the graft survival after 8 hours on another group, then 24 hours, then 48 hours, and finally 72 hours later. There was no difference in graft survival in the first 8 hours, but after that, the death rate came out at about 1% per hour for grafts out of the body above 8 hours. I hope that this answers your question.