12,600 seconds.
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60 seconds an 1 minute 60 minutes in 1 hour 30 minutes in half an hour 90 minutes in one and a half hours. So 90 minutes * 60 seconds = 5400 seconds
1 year=365 days365 days=8760 hours8,760 hours=525,600 minutes525,600 minutes=31,536,000 seconds31,536,000 seconds=63,072,000 half seconds
It's three and one half hours.
43200 seconds / 60 seconds in a minute / 60 minutes in an hour = 12 otherwise known as half a day
There are 5400 seconds in an hour and a half.