The train station is in Terminal 2 of the airport and any arrival there puts you a maximum of 15 minutes easy walking from your point of departure. If you arrive in Terminal 1 count at least 30 minutes because you need to take a shuttle bus. Click here for the airport layout and internal airport shuttles.
Certain time parameters are "uncontrollable". Plane arrival, Customs Clearance, Luggage retrieval. Count about 1 hour for this considering that all goes well... it could be less... or more.
So, all told you'd need about 75 - 90 minutes to catch a TGV train at Charles de Gaulle airport after arrival. Please read the answer about ticket exchanges and refunds... in case of difficulty with the delays. More.
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