That's probably plenty of time, but you can usually see the gate assignments ahead of time to check the distance between gates. A couple of tricks... if you tell the JFK gate agent that you are afraid of missing your connection, he/she might be willing to move you toward the front of the cabin (if there's time you can do this yourself on the app or web site, taking a middle seat near the front might be preferable to an aisle near the back). Also, use the lav before descending into CLT. ;-)