Full of hours; time-consuming.

The times, typically from about 9am to 5pm, Monday to Friday, when non-24/7 office workers are at their desks.

plural of canonical hour.

(temporal location, idiomatic) Late into the night or early morning; when people ought to be sleeping.

The very early morning; the early morning hours; the nighttime hours following midnight, when most people are asleep.

The time period between 10 a.m. and 3 p.m. of a day. / (figuratively) Any easy job, especially one with a short working day.

Alternative spelling of bankers' hours

The number of credit hours a student takes in a semester, usually for a college or university to count towards a degree.

The regular times of day when a shop, office or similar is open to the public.

The fixed block of time during which an employee is expected to be at work; excludes flexitime and leave.