It is VERY tight. You have just one stop on the airside shuttle and no immigration check, but still ... Any delay in reaching 2E (late incoming flight, remote parking stand - 20% of long-haul flights) or long security queue in 2C, and the odds of your making it on time decrease substantially, unless you are driven from your incoming flight to 2C by AF staff (which is easier to manage, BTW, as there is no immigration involved).

As to precise information: the airside bus runs every 10mn and the ride between 2E's main pier and 2C takes 5mn.

But I would personally be uncomfortable with such a connection.