What do you mean by nesting? Is she digging in her whelping box? Most commonly females have their pups between the 61st to the 63rd day. I have had some whelp sooner and I have had some whelp much later. It does not necessarily depend on what day they are bred but when their eggs drop. Male sperm can live up to 5 days or longer in the female's uterus.
The earliest signs of labor is usually restlessness. They might walk around some, lay down some, pee frequently and as the labor progresses they will start panting and digging in their whelping box. As the pups progress through the birth canal the momma may have several bowel movements. Some also start vomiting.
As for how long does it take, each female is different. I have had some deliver the first pup within a few hours of the first signs of labor and other might go through the panting and digging stage for a number of hours. If it is the first litter it usually takes long and also the size of the bitch might effect how long it will take.
Once the hard labor starts most pups are born within one hour.
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