Each engine hour logged on the maintenance record is crucial for scheduling inspections.

An equal hour, defined as one twenty-fourth of a full day-night cycle, remains constant in length regardless of whether it falls during daylight or darkness.

The astronomer adjusted the telescope schedule to account for the varying length of each seasonal hour.

He answered emails at ungodly hours, long after everyone else had gone to bed.

She called me at an ungodly hour asking for help.

We still remember that evil hour when everything went wrong.

Every year our parish prepares incense and vestments for the Great Hours, a service marked by solemn readings and hymns held on the Eves of the Nativity, the Theophany, and Great Friday.

During my working hours, I prefer to take short breaks every two hours to stay focused.

I'll be ready in half an hour, so please start without me.

During the golden hours, photographers chased the warm light along the coastline.