Verified answer

Assuming no lunch break, that is 10.5 hours per day, or 31.5 hours total. Assuming a 1 hour lunch each day, that is 9.5 hours per day, or 28.5 hours total.

What happened the 2nd grade math?

8-18.5=10.5 hours - lunch = 9.5 hours per day * 3 days= 28.5 hours.

Military time.

10.5 x 3 is 31.5 hours. minus lunches @ 1 hour each, 28.5 hours, or @ 1/2 hour each, 30 hours.