9 minute snooze …
OK, I found out the 9 minute snooze answer. I think.
From the site, straightdope.com …
“In the days of dial clocks, the snooze interval was originally intended to be ten minutes max, but precision was unimportant and engineers were content if they could make the interval nine minutes and change. When the industry switched to digital, clock designers figured the standard snooze interval was nine minutes; “and change” went out the window … so what may have happened was, some early chip designer inspected an old mechanical clock with a snooze button, figured that a nine-minute snooze interval had been ordained by the clock gods, and built it into his chip.”

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