Lana is a senior research scientist at Waste Away, a research and development company that develops processes for turning animal waste into useful products such as fertilizer and fuel. Lana supervises several of the scientists as well as one support staff member, Dave. Dave is a lab maintenance technician whose duties include maintaining cleanliness in the lab, sorting slides, disposing of waste, and occasionally filing papers and answering telephones. Dave's work hours are Monday through Friday from 8:30 am to 5:00 p.m. with a half-hour lunch break. He makes $8.50 an hour. Dave lives and works in Chicago, and it takes him 45 minutes each way to commute to the lab every day. Last week, Lana sent Dave to Waste Away's new Peoria branch, three hours away, to help them set up their laboratory, Dave left his apartment at 6:00 a.m. and drove the three hours to Peoria, arriving around 9:00 a.m. He worked until 6:00 p.m. with only a half- hour break for lunch and two 10-minute smoking breaks. He left the Peoria lab and drove straight home, arriving around 9:00 p.m. How many hours should Dave be compensated for?