If the overwhelming feedback is 'blimey thats a bit long and i'm not fit enough!' then alternative routes are available, although this may lead to groups splits which would be nice to avoid if possible.
The inclusion of a pub stop at the Square and Compass is the stumbling block as this is the furthest point from the ferry and there aren't any real shortcuts to get there, so a super slow group would have to give up on a pub stop to seriously alter the route.
It can be shortened towards the end by cutting out either the Franks tank section or the Old Harry/obelisk section.
Alternatively the start could be changed to a more familiar to locals river crossing/Golf course/Franks start which would knock out the need for a return to Franks after the Old Harry descent. This would mean climbing either Rempstone or the radio mast instead of 5 spoke as originally shown on the map though.
Dr P – Are we planning on a picnic stop somewhere between Corfe and the pub stop?