Also have done most of that route, as others have said, we did Hook to Alkmaar on our first day, we did over 80 miles including a diversion to Delft. The quickest bit was travelling through the dunes where progress was rapid, until that is we reached a village where the signs disappeared. You have to be alert to spotting them, no rhyme or reason as to their placement, having now done over 2000km in the Netherlands it's a lot easier but even now we occasionally get caught out. Enjoy