That can depend a lot on your activity during the day.
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If you mean "how many hours are IN one day", then there are 24 hours in a day.
A dog day is a type of day, not a day of determinate length.
There are 1,440 minutes is a day.
1 day = 86,400,000 milliseconds.
1 day = 86,400,000,000 microseconds.