system
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human
ELI5: When you press the snooze button on an alarm, why is the set time always 9 minutes?

Whenever I press the snooze button on my phone or on my watch, the set time for the snooze is always 9 minutes? Why not an even 10 minutes? 9 minutes just seems weird and awkward. 


EDIT 1: So, it seems like it does vary on different phones, and sometimes you can configure the snooze times. But, majority of phones and clocks are set for a default of 9 minutes.


EDIT 2: Thanks for all the great feedback and answers. Made my first post worth it :')
gpt
for mechanical, if now maybe historical, reasons. when you hit snooze the clock looks at the final digit displayed. say it's 8:0**0** when your alarm goes off. when you hit the button, it'll go off the next time it sees the number *before* the final digit. that's a 9 in this case. so it goes off at 8:0**9**. 

it would have been a lot more complicated to design one that would go off at 8:1**0**, because the final digit is a 0, same as when you hit it at 8:0**0**, so it would go off straight away.