Unit h
Name hour
Category Time
Details In the field of time, an hour (abbreviated as h or hr) is a unit of measurement that represents a period equal to 1/24th of a day. One hour consists of 60 minutes, and each minute is composed of 60 seconds, totaling 3,600 seconds in an hour. Hours are commonly used to track time durations, like the length of a movie, the duration of a work shift, or to set appointments and schedules. Hours can also be used to express time elapsed since a certain event, for example, "three hours ago." The concept of hours dates back to ancient civilizations and the use of sundials to divide a day into equal periods of time.