If you've only got an hour, I seriously recommend that you spend that time running to catch your plane, otherwise you'll likely miss it. CDG is a nightmare to get around in my experience, and you'll probably have to wait for 20 minutes to get on a f***ing bus that'll take about another 20 minutes to take you a distance you could walk in 5 and to top it off it'll be back in the direction you came. When I was there last I literally sprinted (well as literally as I could manage) from one end to the other, I made it, but my bag didn't and when I got to the states they said they'd drop it off for me which I have to say I was impressed with - as the airport was an hour or so away from where I was staying - however, I wasn't so impressed with having to get out of bed at about 5-6am the next day and go out into the street to get it from some bloke in a truck.
If you've got 5 hours on the way back though, a brisk walk might suffice.