Steve,
the Simmons pistol scopes (sometimes) available in the UK have a much longer eye relief than that. I would hazard a guess at somewhere around 20"+.
I've got one on a Rohm and I need to extend my arms fully. I just sold Mr. Petts a little Nikko that I picked up along the way, It had a slightly shorter eye relief. I don't know too much about the likes of Burris, Leupold etc but had been lead to believe that eye relief can indeed be much shorter on certain models.
Chris