I am really sorry I have only just seen your question.
As it is 3 days old now I guess whatever happened has already happened. I hope your dog was okay.
Yes 24 hours in actual labour for a dog is way too long. Though there can be 'nesting' behaviour, panting and restlessness for a day or so before labour sets in.
Did you call the vet?
When there is something definitely wrong with any dog it's always wise not to wait for answers here or any other place online, but to get to the vet quickly. They are the only ones who can really help.