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It might not take 8 hours but it depends on what Concorde you have, if you use the payware one it takes 3-4 hours to get from London to New York which is our hop that evening.
If you need a freeware go to Simviation and type in the search Concorde Package (with VC).
Also Concorde is a difficult aircraft to manage so use as much of your fs experience as you can.
I will make a signature banner soon.