After years of training, the day came when it was finally one's hour to prove oneself.

Volunteers showed up at all hours of need to support the families.

She arrived in my hour of need and changed everything.

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

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.

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

We kept working through the little hours to finish the project.

The beach is at its most peaceful in monkey hour, just before the sun dips below the horizon.

Zoo staff scheduled extra feeders during the monkey hours to ensure the primates stayed healthy.

The generator's performance degraded after 1,200 horsepower-hours of continuous operation.