There are 604,800 seconds in a week. Calculation:

• 1 minute = 60 seconds
• 1 hour = 60 minutes × 60 seconds = 3,600 seconds
• 1 day = 24 hours × 3,600 seconds = 86,400 seconds
• 1 week = 7 days × 86,400 seconds = 604,800 seconds