If you want 8k then I think you have to put the effort (be it time or money) into making sure the horse is fit enough for a five stage vetting.
Mine was super fit on 5 days hacking a week, not sure why a horse would not be fit on that much work.
Well it depends a lot on what hacking you do! the fact is I felt the horse wasn't fit enough for the vetting on the day, perhaps I am soft and others wouldn't have thought anything of it? I guess that is probably very much the case here but I do feel super protective and careful not to do more with any horse than I think its up for and to see a horse that I potter around on a few times a week suddenly have 2 lunge sessions, a hard ridden session, 2 rounds of flexion tests and numerous separate runs up and down in the space of 2 hours didn't sit comfortably with me and I wasn't sure whether to put her through that again or not.
As it is I have decided to keep her and put the work in and perhaps do this again next year with her in peak condition and probably with a few competitions under her belt so she is more proven.
Vets vary how much they do and it is not always related to how fit or not the horse is or the purpose it is being bought for, I have had some do far more than I would expect and others that have done very little, they rarely get what I would call a hard ridden session but some certainly do more than required to get the heart rate up.
Normally there will only be 1 short lunge again a good vet will usually see enough in just a few circles on each rein to know whether the horse is sound enough to continue with, most do 2 lots of flexion tests but sometimes they just do one at the start and finish with a trot up.
I have been with a vet for anything from 45 mins to the best part of 2 hours and often feel the best vets have been the ones that are more experienced and get a feel for the horse from the start and get through the vetting with least fuss, they normally pass, the slow pedantic ones often seem to be looking to fail rather than looking to pass, the wrong way round in my view as you can make any horse respond to a flexion test if you want to.