Allowing for leap years, there are 6573, 6574 or 6575 days in 18 years. That is equivalent to 567907200, 567993600 or 568080000 seconds respectively. Furthermore, there may be some leap seconds - usually added but occasionally subtracted.
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788400000 seconds
18 days = 1,555,200 seconds
568 024 668 seconds
There are 60 seconds in one minute. Therefore, 18 minutes is equal to 18 x 60 = 1080 seconds.
5 * 60 (minutes) * 60 (seconds) = 18 000 seconds