A day has 24 hours.

I have been to France once.

He finished all his work all at once.

There is a test in two days.

The first day of the month is the beginning of a new month.

It's my daily routine to exercise at the gym every day.

I watched that movie three times.

He swore never to repeat that mistake twice.

He goes to the gym twice a day.

Our project is scheduled to be completed on the twentieth day of the month.