" You can’t have women working in an office building after two a.m. unless it’s a public service, but I have to give my clients all-night service, so there on Sixty-ninth Street I’ve got four operators for the three switchboards, and they all live right there in the apartment. That way I can have one at the boards from eight till two at night, and another one from two o’clock on. After nine in the morning three are on, one for each board, for the daytime load. "

― Rex Stout , Three Witnesses (Nero Wolfe, #26)