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Hello. Thanks for the question.
I typically go by a 2 and 4 hour rule. No more than 2 hours of active labor and no more than 4 hours between puppies. Once we're outside those markers, then it's time to get in to a vet and usually go to c-section to get the puppies out. This gives the best chance of live puppies and it's also the best way to keep mom from getting septic.
With that in mind, we're over 12 hours. I would absolutely go in to an ER vet or your vet when they open.
I hope this helps, let me know if you have any other questions.