If You’ve Waited 90 Seconds, You’ve Waited A…
Answer: a Moment
Although in modern usage it has become a fairly ambiguous term meaning “a short span of time”, historically a “moment” was a distinct measurement of time.
What was the moment equivalent to? In medieval Europe a moment was 1/40th of an hour, or, 90 seconds. Knowledge of this discrete unit of time was clearly lost on modern mothers who have answered many a nagging child’s inquiry with “In a moment, dear.”