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

"Thank you so much; You saved my day !"

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

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

Days Sales Outstanding is a measure of how long it takes for a company to collect payment from its customers.

I have been working late for five straight days.

It's just one of those days where everything seems to go wrong.