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If you allow for a leap year every fourth year, there are 365.25 days in an average year. In that case,

11 years @ 365.25 days per year = 11*365.25 = 4,017.75 days

4,017.75 days @ 24 hours per day = 4,017.75*24 = 96,426 hours

96,426 hours @ 60 minutes per hour = 96,426*60 = 5,785,560 minutes

5,785,560 minutes @ 60 seconds per minute = 5,785,560*60 = 347,133,600 seconds.

However, every fourth year is not a leap year. Centuries are not leap years unless they are divisible by 400. So an average year, calculated over a 400 year cycle, works out at 365.2425 days. On this basis, 11 years would be 347,126, 472 seconds.

This does not allow for leap seconds that are introduced from time to time. The last leap second was at the end of June 2012.

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10y ago
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