1) Between 8 am and 9:20 am there is one hour and 20 minutes
so
2) Between 9am and 245pm there are 5 and 45 minutes
so
3) Between 11am and 3:55pm there are 4 hours and 55 minutes
so
4) Between 8:30 am and 10:40pm there are 14 hours and 10 minutes
so
5) Between 5:30 pm and 10:45 pm there are 5 hours and 15 minutes
6) Between 7:20am and 11am there are 3 hours and 40 minutes
so