Doonesbury by Garry Trudeau for October 20, 1978
Roland: Cabin fever plus two weeks. The drama comes to a close... the two weeks of day-and-night summitry finally catch up with an exhausted President... taking the evening off, Mr. Carter heads out to RFK Stadium, where is the honored guest of the management of the Washington Redskins football club... Carter: Just coffee. Why? Duke: For thirteen straight days? C'mon, sir, you can tell me!