system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do alarms have a default snooze duration of 9 minutes?

Some alarm clocks let you change this timing, but why are most set to 9 minutes as default instead of 10 or 5 minutes?
gpt
mechanical reasons. the clock looks at the last minute it's displayed for it's alarm. snooze makes it go off again the next time it hits that number. for example, if it's 8:00 and you hit snooze, the previous minute is 7:5**9**. the clock just registers the 9, and will give an alarm next time it sees a 9. if it were to look at the current time, it's a 0 at 8:00, it'd go off again right away. 

it would be a lot more complicated to make a clock that can look at both final digits, and most people are fine with 9 minutes. it gives you that one more minute of being awake without quite having to get up yet. probably the most bittersweet minute of your day.