He slept an hour.
I studied for one hour.
He turned up an hour later.
I will call you in an hour.
I play tennis an hour a day.
I talked with her for an hour.
He will be here in half an hour.
She made me wait for half an hour.
I finished the work in less than an hour.
You should have left half an hour earlier.
I ate a large pizza with a friend an hour ago.
Tom has been talking on the phone for an hour.
Bob charged 3 dollars an hour for mowing lawns.
I have to go shopping. I'll be back in an hour.
She calls him every night and talks for at least an hour.