If you have set an alarm in iOS and pressed the snooze option, then you have noticed that iOS 9 postpones alarms for exactly 9 minutes without being offered any other option to customize this time period.
Many people asked why Apple chose it the 9-minute period for snoozing alarms set by users in iOS 9, and now we also have an explanation for the apparently unusual decision of those from Cupertino, having to do with the past of mechanical watches.
More precisely, some say that postponing alarms for 9 minutes would actually be a tribute paid by the Apple company to the old watches, which in the past only had the option of postponing an alarm for 9 minutes, this limitation being imposed by their construction method.
It is my belief that when the first hybrid electric clocks arrived THAT is when a seemingly 9 minute standard was adopted. These old electric clocks physically flipped cards to indicate the time. Driven by an electric motor that uses the cycles of an AC connection to remain accurate.
You have a very extensive explanation in Quora website, there a user giving a brief history of mechanical clocks and the first hybrid electric clocks, apparently being the point at which the 9-minute delay standard would have been adopted globally.
Of course, Apple could choose any other period for snoozing alarms in iOS, but it would be more useful to offer us the new option to choose to set the period for which the alarms are snoozed in the iOS Clock application.
