That's an epic cruise route - perhaps too long I'd suggest.
You'll need lots of regroup points which will drag the cruise out into a full day... Any reason it's gotta be a Saturday?
My car's been playing up lately It dropped the bottom radiator hose on the weekend and i've got to get it looked at as at the moment it's only got water in it and I think the spring clip that holds the hose in has lost some of it's tension.... Stupid French cars
my plan was really to have points marked where we would stop to let our brakes cool, and engines if that where to be the case and regroup, i have done that cruise route a few times and its actually pretty quick since those estimates are the speed limit
i was also thinking of organising a barbi at the end, we could do a sunday but we would have to plan ahead and most people use it for other things or work at double rate,