He wondered whether the designers of the phone had performed clinical studies on snoozers in order to decide on the nine-minute interval. Why not eight minutes, or ten? The makers of the phone were famously particular about design. This had to have been data-driven. It was no coincidence that Dodge was being afforded just enough time to lose the thread of consciousness before the alarm went off again. If the interval had been much shorter, he would not have had time to drift off and so this feature could not have truly been called a snooze alarm. Much longer, and the snooze would have deepened into true sleep.

— Fall; or, Dodge in Hell by Neal Stephenson (Page 6)