I don't know how strict this is, but went I was sent to BMW "University" (Brand Academy) they stated that every series is scheduled for a new model every 7 years. The facelift (if deemed necessary) is done at the 3-4 year mark.
Granted they shoved a lot of brand nonsense down my throat that day, I don't really remember much except that they made me wear a funny hat when I went into the MINI Room...
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