I need to take 15 credit hours this semester.

I am taking 15 credit hours this semester.

The generator produced 1000 horsepower-hours of electricity.

The electric car has a battery capacity of 60 kilowatt-hours.

I have very few little hours left to finish my project.

I couldn't sleep, so I stayed up until the wee small hours.

The triple witching hour is the last hour of trading on the third Friday of March, June, September, and December when stock index futures, stock index options, and stock options all expire simultaneously.

The watt-hour meter measures the amount of electrical energy consumed.

I prefer using the 12-hour clock instead of the 24-hour clock.

I always use the 24-hour clock to keep track of time.