It's definitely true that a prolapse is some of the hardest work out there, up there with C sections. I was a kid the first and last time we had a uterine prolapse around here so I've never really had any real firsthand experience fixing it, but I know it was at the 4-6 hour mark when she got put back right-side-in, it was a neighboring rancher that did it for us. I have had LOTS or experience with vaginal prolapses.. last one was a 12 year old cow that prolapsed at breeding time, took me a day to get her up into the pens to work with her, and then LOTS of washing a very crusty thing by that time, and another half hour of wrangling to get it back in.. it stayed, she didn't infect, and I think she actually bred.. didn't see her come into heat again.