It takes around two to two and a half hours on high speed train to get from Paris to Nantes, and…read morewell, that's exactly what we did.
The train ride was pleasant. The seats were spacious and they even announced the stops in both English and French. Oddly enough, though, when we arrived to Nantes, the signs were in English, French, and German.
All that said, unlike the train station in Paris, the one in Nantes had a parking garage nearby, plus many shops around. That turned out to be great for us as we got picked up quickly and went off to our next destination. Not a bad trip if I do say so myself.