The answer depends on where it is 9 am through 12 pm.
21
12pm
9am - 12pm every day.
It would be 8 am Central time.
Pacific Time : 9am Mountain Time 10am Central Time: 11am Atlantic Time: 12 pm
11am
8 AM
When it is 9am in central time, it is 8am in Mountain time.
10AM in PDT time would be 9AM in Central time.
7 AM Pacific.
It would be 10AM EST.
9am, 10am, 11am, 12pm, 1pm, 2pm, 3pm, 4pm, 5pm. 8 hours.