There are:
60 seconds in 1 minute
60 minutes in an hour
24 hours in a day
So the answer is:
60*60*24*90=7776000 seconds
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About 2,840,184,000 seconds in 90 years.
Considering an average of 365 days per year (not counting leap years) the number of seconds in 90 years would be 90 x 365 x 24 x 60 x 60 = 2838240000
90 seconds
There are 60 seconds in 1 minute, therefore 60x90 = 5400 seconds in 90 minutes.
There are 60 seconds in one minute. Therefore, 90 minutes is equal to 90 x 60 = 5400 seconds.