I did the 135km route with my friend Eve (a world masters pursuit champ). We left at 06.50 and arrived back at 16.20, having 30 mins stop at each feed. I rode the whole distance (38x24 bottom gear), but Eve walked up some of the steeper climbs.
I'm in the CTC top (row 5&6)
and a photo of both of us at the finish is here