We arrived at terminal 2E on a Delta flight. We were in business class so first off the plane. If you’re in the back of the plane, add 10 or 15 minutes to my time. We didn’t have any luggage to claim so add a couple of minutes?? for that. There was almost no line at immigration but when we left, the line was growing and looked to be at least 15 minutes.
So we got off the plane, walked for about 10 minutes, took the little train from 2E (M gates) to the 2E exit area, walked a bit more to get to immigration, cleared immigration, then walked over to the Gare - which is well-signed once you leave the baggage claim area.
Total time for us :40 minutes.
We got off our plane at 1:35 and arrived at the station at 2:15. We had booked a train at 3:00 and made it.