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That's what makes it hard
The potential poor weather and the monotony of the flat. It must be like the fans but longer.The only Dutch riding I ha e done was from hook van Holland to liege. Did that in a day as it was not so far and the urban areas broke it up but this route is not that urban. Perhaps pack a pannier full of food.
cycleclinic-
I've done a Dutch 400. The scenery can be reasonably varied, although athletically the lack of ups and downs makes the pedalling quite monotonous.
The cycle paths have the problem of often going around the edge of towns and not having facilities directly on them. Whereas a British audax route will naturally go past village shops and garages etc, it's quite easy to plot a route all the way across NL on cycle paths that goes past nothing.
grams
Also. No hills, must be so boring!