24-72 hours is not unreasonable as a turn around time once data is received. It takes time to enter the data and to verify that the information you've been given is true, accurate, and correct. The billing company I worked for had a 72 hour turn around time limit.
Once all data has been entered, everyone stopped working and made calls to ensure that
(a) the insurance info provided was correct.
(b) The policy is still in effect
(c) verified claims address as being accurate.
(d) checked prior dates of service for insurance that paid to move uninsured patient to insurance responsibility.
(e) called uninsured for possible insurance coverage.
We saved so much money by doing this because we didnt send claims where policies were terminated or there was other insurance that was primary or the patient forgot to give insurance at the time of service.