fastest route sarlat to orly

What would be the fastest route from Sarlat to Orly on a Sunday? Via Michelin has it at 5h40m - A20 A71 A10; Google Maps at 5h11m - A20. I know the traffic will vary these times, but all of Via Michelin's times are considerably longer than the Google route. Then another hour into Paris, according to Ed.
Thanks

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