MIDLGW,
You are not correct. Duty Hour are the hours you are on duty.
It does not include the time you are down route in the hotel.
If it did we would all be doing 5000 hours a year.
The hourly meal rate IS however paid for all the time between check in to check out and this dose include the time in a hotel but this is not DUTY HOURS. They are two different things.
Flying hours are from chocks to chocks.
Duty hours are from check-in to either check out time or 30 mins after chocks if you are down route.