As long as the range....
is enough to get old beardy to his private island then it will be enough.
PErsonally, it needs to be able to fly from London to Sydney over the ocean all the way (i.e. down the Atlantic, hang a left at Cape Town and over the Southern Ocean all the way to Oz.
Naturally, that ain't gonna happen so this will be another DODB (Dead on Drawing Board) project.