There are 604,800 seconds in a week. This is calculated as follows:

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