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There are 86,400 seconds in a day (24 hours x 60 minutes x 60 seconds). Therefore, in a day and a half (36 hours), there would be 129,600 seconds (36 hours x 60 minutes x 60 seconds).
two and a half seconds
30 minutes × 60 seconds = 1800 seconds in half an hour.
2 and a half hours is 90 seconds.
There are 5,400 seconds in an hour and a half.