Hi Pat
It is rather a long wait but I would advise you to stay within the airport. Once you've looked around the shops, had a coffee, eaten lunch and read some of your newspaper or book, it won't be too long until you fly.
I once spent 12 hours waiting for a flight at Sheremetyevo Airport in Moscow. There was only one shop and I'd run out of roubles!
Kind regards,
Olly, your editor