If I see a doe actively pushing, circling, getting up, laying down, getting up, digging, some more pushing, I would expect to see a baby in atleast 2 to 4 hours, If I see a peek of the bag(looks like a bubble) I give her plenty of time. Can take only 10 minutes can take an hour, My husband is funny he says, "They need time for everything to strecth out don't be tooo anxious." He is soo patient. There is that point when something doesn't seem right, she is in a lot of pain, she looks exhausted when it is time to help out.
I see does that look like they are having contractions and then a week goes by and nothing, When a doe is heavy with kids and they are laying down every move they make looks like a contraction, they can get really uncomfortble looking. But the tell tale sign is the circling, digging, up and down, and most times a string with thick discharge.
With that said, I have been in the barn working and had a doe walk across the barn and drop a baby right on the ground, I have gone out of the barn and when I came back in 15 minutes later, new babies, just some how appeared and mom just busy taking care of them like they had been delivered in a basket or something.
I have one doe that slams her head into the wall the entire time she is in labor, 3 to 4 hours, she makes it look miserable. Another doe I have starts running around earlier in the day checking out all the other babies and talking to them, I have even had her let other babies nurse before she has hers and steal babies, this is her sign she is going into labor.