Assuming 8am and 5pm refer to the same day!Use the 24 hour clock
8am = 0800 hours, 5pm = 1700 hours
1700-0800=900 = 9 hours.
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9
8am to 5pm is 9 hours, deduct 1 hour for lunch = 8 hours. If they're both in the same day, then 8am to 5pm is a span of 9 hours, regardless of how you choose to use them.
9
11 hours
15hours