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From 7:30 to 6:30, there are 11 hours. If you count from 7:30 AM to 6:30 PM, it is a span of 11 hours.
9 hours.
10 hours and 15 minutes.
10.5 + 24*k hours where k is any integer.
If they're both on the same date, then they mark a period of 21/2 hours.