They started hours ago.
To become a professional banjo player, you need to spend thousands of hours practicing.
Within hours, the world knew the news.
After spending hours out in the cold winter wind, my skin got all chapped and dry.
Two hours is too short for us to discuss the matter.
The usual business hours in this office are from nine to five.
Thomas A. Edison so loves his work that he sleeps an average of less than four hours of each twenty-four.
Tom needs at least nine hours of sleep every night or he can't function.
In the first few hours of the battle, Union forces were winning.
Never choose a vocation just because the hours are short.
The handyman was supposed to arrive at twelve noon, but got stuck in a traffic jam for a few hours.
A few hours nap will do you good.
I hear that studying in the morning is more effective. Studying one hour in the morning is as good as three hours at night.
During the rush hours in Tokyo, traffic is heavy.
The people in the next room stay up until all hours doing God knows what.