I guess your fathers friend has never ridden an R65 because the comment about an hour is a load of balls. Any well looked after R65 is perfectly capeable of doing long trips at uk motorway speeds so long as you are look after her.
On both the Bimbo and now the RT I regularly make 300 or 400 mile trips, and a couple of times every summer for the last few of years mine does the 900 mile (each way) jaunts to my wifes fathers French summer home. The last time I went last summer I did the return trip in one hog at an average speed of 75mph (on the motorways via the channel tunnel). I would not recomend anyone spend 16 hours on riding any bike but the RT did not mind in the slightest as it was not the bike that was the weak point but me!