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That's a great philosophy, especially if you've the time to avoid motorways. In the UK, I almost never rode on dual carriageways or motorways as it's such an unpleasant experience. In France I used to use the peages a lot to get to the more interesting bits and always at very high speeds. They were so smooth and empty, that you almost feel like you're flying after a while.
I did usually stop for a 15min kip in the rest areas every few hours. Good to give the brain a rest from the thousand yard stare thing you get after going fast for a long time.
After quite a few long trips I've changed my approach. I used to go hell for leather to get there as fast as possible, ending up breaking all the rules and arriving in miraculous times but tired, stressed and angry. Now if I start to speed up and get stressed I stop and have a rest, drink or eat and chill then get back on with it, arrive feeling much better and enjoy the journey.
Definitely search out the roads worth riding on the way too.