How many hours does 160 laps take in a Nascar race?

A 160 lap Sprint Cup Series race can take roughly three hours to complete, this usually depends on the amount of cautions during the race.

For example, the 2011 Brickyard 400 was completed in 2 hours, 50 minutes and the 2012 Pocono 400 finished in 3 hours, 3 minutes. That's basically the normal average.