Yup normal for a long rideout.
If its any help I'm still hungry on Tuesdays after killing it at the weekend. I find drinking lots of water and eating good quality pasta helps a great deal.
All you've done is deplete the protein store and the carbs have been munched too. All your body is doing is trying to replenish those stores that you've delved into.
Did you have a decent protein drink after each leg of your journey ( I doubt you did, beer probably ) I find that after a ride these days I need a protein drink to help recover, they're not bad these days, bit expensive mind but then you have just completed a decent journey.
Don't eat rubbish, try to steer clear of crisps n chocs.
Bask in the glory of a rumbling tum.