It is 4 hours.
4
Four
830 930 1030 1130 1230 130 230 330 7 hours
The time from 0530 to 1230 is 7 hours. To calculate this, you can subtract 0530 from 1230: 1230 - 0530 = 0700, which equals 7 hours.
20.5 hours.
3.5 hours.
8.5 hours
7 hours
7.5 hours
6 hours.
Three hours
3 hours.