Really anytime during the day but as previously stated, after noon time is busy. Try the flight radar app, shows you the active flights, destinations and more and helps you see where they are although the flights turn on their transponder close to take off.
It varies on season and weekday. There are many resources to see arrival and departure times for CLT and you can plan your visit around that.
Honestly anytime between 7am and night fall. The majority of planes around around noon and 7pm, though.
Morning around 9 to 11
We were there around 2 PM on Sunday and had to wait about 30 minutes. Then it was continuous take offs and landings. We left around 4 PM.
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