The reason no one is responding is because this is not an easy route. You can fly but it is not non-stop. The train is 12-15 hours and driving is 10 hours...
This is the shortest train itinerary I could find: 11 hours, others were 14
Metropolitan City of Genoa, Italy
Genova Piazza Principe
TrainRV2500Torino Porta Nuova
1 h 51 min (7 stops)
Stazione TORINO LINGOTTO
TrainRV2043Milano Porta Garibaldi
6 min (non-stop)
Torino Porta Susa
5 h 43 min (7 stops)
Paris Gare de Lyon
About 13 min
Subway6Charles de Gaulle Étoile
14 min (11 stops)
2 h 4 min (non-stop)
Gare de Bordeaux Saint-Jean
About 5 hours by plane, non-direct flights mostly thru Paris
By car along the French coast-- 10 to 11 hours
Travellers here often ask about unrealistic fastest direct routes. But if you treat it as a road trip or train trip there are plenty of wonderful places to visit in between Genoa and Bordeaux ( as an aside IMO neither of which are world class destinations ). Only a stressed business executive would want to do this in one go .. if you are a tourist take the time to explore.
That is true about taking time to travel and explore but one needs to have an accurate idea of how long it will take to get directly from A to B to start making realistic plans.