6 hours and 20 minutes equals 22800 seconds.
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1 day = 24 hrs, so 7 days = 168 hrs Each hour is 3600 sec, so 168 hrs is 604800 sec Hence 7days = 168 hours = 604800 seconds
2.5 hrs = 150 minutes 150 minutes = 9000 seconds
144 hrs or 8640min. or 518,400 sec.
15
19 hrs 42 mins 28 sec