1. plural of hour; periods of time equal to 60 minutes each
2. the time during which a business, office, or institution is open
3. a long time; an extended period
Usage: informal

Examples

• The meeting lasted three hours.
• Store hours are 9 AM to 6 PM.
• I waited for hours at the airport.
• What are your office hours?
• The library has extended hours during finals week.
• We’ve been driving for hours.
• The museum is closed after hours.