You would have to explain why you want to spend 4 days on that journey; it can be done in about the same number of hours.
Calais to Mons is about 2 hours, and Mons is about 1/2 way to Bastogne.
So, for me, I would get there and then enjoy the area of the Ardennes - anywhere, up and down the border of Belgium/Germany and the vicinity.
e.g. Monschau (spelling?).
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Dave
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