"Maybe D&D isn't for you..."

[Tanarii]

Yeah, forty-five minutes is probably an exaggeration. Though the need to go over the rules and answer questions and such like does make playing a game for the first time take a bit longer than normal.

The rules for a new modern board game usually takes 45 minutes just to figure out and explain.

But you're not wrong, once the rules are known board games tend to be in 2 hours to play range, from Monopoly yo Risk to Axis and Allies to Gloomhaven. Where-as the standard / norm for TTRPGs seems to be 4 hours for a session.