It would be 7 hours
255
2 hours, 22 minutes.
6 and 1/2 hours
1 hr 2 minutes
10 hours and 40 minutes.
I do it in two parts. I calculate how much time has elapsed between the AM and noon, then how much time has elapsed between noon and the PM, then add them together.
18 minutes
6 hours have been elapsed
255
The elapsed time of 1 pm to 9 am is 20 hours.
2 hours, 22 minutes.
10 hours
About 30 minutes
6 and 1/2 hours
1 hour and 40 minutes.
Two hours elapsed time.
10:20