We are arriving Charles de Gaulle, Terminal 2, and need to change to Terminal 1 to catch our flight home. How much time should we allow to change terminals?
According to www.easycdg.com, you should allow up to 75 minutes between your scheduled arrival at Terminal 2 and your scheduled departure from Terminal 1.
I've done the Terminal 1 to Terminal 2 switch, and depending on where your gates are, I'd allow MORE time than that. Terminal 2 is sprawling and walking to a gate can take 15 minutes...
CDG is probably my least favorite airport (and that's saying something when you live in Rome and deal with CIA and FCO - LOL!!!), but I've had more mis-adventures there than any other airport in the world... so I'd be overly prepared for CDG! Good Luck!