About 5 and a half feet.
He probably doesn't sleep in the suit, so you might get a more accurate answer if you ask "How long is T'challa?"
It's not how long it is that matters but how it makes you feel
There is a site called Metacritic. Not only does it give you information about the movie itself, but it gives you the average of What over 50 professional critics judge the movie. It's a really great site. Black Panther has a metascore of "88", based on 53 critics, and a run time of 134 minutes.
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