
There is going to be a huge difference of opinion depending on breed IMHO.
With toys normally going early as "just the usual thing", as opposed to larger breeds having perfectly healthy litters after a longer cooking time.
I do admit, even with a large breed, I would be in a panic at day 70! Yet Sharon, who doesn't have a large breed, did just fine when her bitch went that long.
I think, ridgielover, that as you know your own girls best, and can feel pups moving, that you have to go with your gut. It is such a difficult call to make. I once had a bitch examined at 7pm and was told by the vet that pups were moving well, that the bitch had not dilated, and she had no milk. She underwent an emergency section at 11pm so I was right in my worry. And, as a breeder, you must go with your own feelings. I would rather be told that I'm being paranoid by my vet than leave it too late!
I do sometimes think that we are more likely to get it right than the vet. No disrespect to vets in any way, I think mine is great. But I bet I've whelped more bitches than him! :-)