I'd want an hour or (better) two, at a minimum. Charlotte is not a bad airport to have a layover. Plenty of shops, restaurants and several nice areas to relax with rocking chairs. If you have checked bags they won't make it to the next plane.

Charlotte Douglas International Airport (CLT) is a major American Airlines hub known for being relatively compact compared to other mega-airports like Atlanta or DFW. For a domestic-to-domestic connection, a layover of 60 to 90 minutes is generally sufficient to move between any of the five concourses (A through E) without stress. The airport is laid out in a "hub and spoke" design, and you can walk from the furthest gate in Concourse A to the tip of Concourse E in about 15 minutes at a brisk pace. However, if you are connecting from an international flight to a domestic one, you must account for immigration, baggage claim, and re-clearing security, which requires a minimum of 2 to 3 hours to be safe. Charlotte is frequently praised for its efficiency, but its hallways can become exceptionally congested during peak travel banks. If your layover is under 40 minutes, you are at a high risk of missing your flight if your first leg is even slightly delayed or if you are parked at a "bus gate" in the regional Concourse E. For a "no-stress" experience that includes time for a meal at the famous rocking chairs in the Atrium, aim for a two-hour window.