6 hours 30 minutes
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two and a half 1:30 + 1:00 = 2:30
7
10.5 + 24*k hours where k is any integer.
0:30 + 1:00 + 4:45 = 6:15 = 16:45 - 10:30 six hours 15 minutes
From 8:30 AM to 5:00 PM is a total of 8 hours and 30 minutes. This can be calculated by counting the hours from 8:30 AM to 5:00 PM, which is 8 hours, plus the additional 30 minutes.