330 minutes are between 9am and 2:30pmm of the same day. That is also equal to 19,800 seconds.
Five hours and thirty minutes.
[(24+9)-(12+6)] x 60=900 minutes
From 9am to 6:30pm is 9 hours and 30 minutes.
The parameters you cite contain eight hours and 30 minutes.
15 minutes
8 hours 30 minutes excluding the half-hour lunch.
45 minutes before 9am would be 8:15am. To calculate this, you subtract 45 minutes from 9am, which gives you 8:15am. This is because there are 60 minutes in an hour, so subtracting 45 minutes from 9am leaves you with 15 minutes before the hour.
21
6, 7, 8, 9 Therefore, there are 3 hours between 6am and 9am.
6:15am to 9am is 2 hours and 45 minutes.
9 hours 45 minutes 9am to mid-day = 3 hours mid-day to 6.45pm is 6 hours 45 minutes 3:00 + 6:45 = 9:45
4 hours. 9am until noon is 3 hours and 1 more makes 4.