Are you kidding? I have had girls go 3-4 hours before the 1st puppy is born. As long as there is no distress, no unusual discharge and nothing to panic about, let nature take it's course. I do agree if this is your first litter, please call your vet and get help.
Why would I call the vet? There is nothing wrong. Not yet anyway. It is not my first litter as you may have assumed. I just don't remember the time frame you would expect the first puppy. Thank you for the help.
Hope all is fine. Mine usually has a pup about an hour to an hour and a half after water breaks. But the ones who have gone over that really do start to get me stressed. It just takes time. Always glad after the first pup arrives. Good luck.