Elections are easy, audits aren't.

Given the number of machines and people involved in running an legitimate, fair, election, results should be available within hours.

Now take smaller number of people that to inspect each ballot, check it vs actual voter rolls, death records, public records, addresses, etc, double, triple check it and the process takes a while especially if there is fraud.

I've done election roll audits, (not ballot audits), in another state and it's hard, boring work that requires attention to detail. (Yes, we found widespread fraud, it was a blue county...)