9 hours.
10 hours and 15 minutes.
10.5 + 24*k hours where k is any integer.
If they're both on the same date, then they mark a period of 21/2 hours.
There are 8.5 hours. * hours and 30 minutes
12 hours
7
6
Well, honey, if you can't count the hours between 6:30 am and 3:30 pm, then we've got bigger problems on our hands. But since you asked, that's a total of 9 hours. Math doesn't have to be a mystery, darling.
Ten hours.
8 hours.
9 hours.
9 hours.
8.5
10 hours and 15 minutes.
10 hours and 45 minutes.
12 hours 30 minutes.