Greece.... The long way!

iguana:

Franglais:

How long by Road, compared to 24hrs(?) on the boat?

3720 miles by Road Calais-Athens shortest route

2135 miles on road Calais to Ancona (via Swiss cheapest) then ferry, then Patras to Athens & return

So ferry saves 1585miles, if you do circa 500 miles a day driving, it’s 3 days extra driving by road.
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I think your 3750 miles is slightly wrong, In days gone by in my old 111 pulling for Wilgo freight,

I did the London Athens London shuttle, Mainly groupage or ciggies out, Heavy denim cloth back.
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When the permits were a bit short MM ones did the job. As long as you chose the route correctly, Over Cenis,
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Trieste, Belgrade, Gevgelia, run down to Athens IIRC it was around 3000ks, 1860miles and that was the longer route.