2880 half-minutes per day.
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There are 60 seconds in a minute, so to find the number of seconds in 30 minutes, you would multiply 60 by 30. This equals 1800 seconds. Therefore, there are 1800 seconds in 30 minutes.
86,400 seconds in a day
30 minutes = 1,800 seconds
One day more = 24 hours. 24 hours = 86 400 seconds
1 hour = 3600 seconds 30 minutes = 1800 seconds 1 hour + 30 minutes = 5400 seconds