I've been using my cell phone as primary alarm clock for years, and it always bugged me, for reasons I can't even articulate, that the snooze interval was "wrong"---ten minutes on one phone, five on another. When I finally got my Android phone and could find my own alarm app that let me configure the snooze time, I was inordinately pleased. 9 minutes it is. :) (Alarm Clock Plus, by the way---has a few other nice UI features as well.)