I'm looking forward to the days of rest this weekend.

I will visit you one of these days.

I will finish the project in a few days.

In days of yore, people used to travel by horse and carriage.

Back in the days, people used to communicate through letters.

Day after day, she practiced the piano.

The weather varies from day to day.

The new fashion trend was just a nine days' wonder.

I have been working late for three days in a row.

I have been working late for five straight days.