Calculating numberr of patients seen every two hours in ED

Hi;
I need to find out how many patients are seen every two hours per day of week for an entire year in the emergency department.
I've included a small data set that I have cleaned up from the electronic medical records.
What I am trying to discover:
The busiest times in the emergency department so that I can staff accordingly.

The actual data set is HUGE. It is for an entire year. But once I have a formula, I can calculate for the entire year.

And as an FYI: I have learned formulas on this forum that I have used so much in my work...so THANK YOU FOR YOUR HELP!!!!