You are quite right, novae and supernovae happen over a much longer time scale. I've found that a lot of people don't realise this, and have a Hollywood version of star death in their mind when they think of dying stars - as in KABOOM! (star winks out in an instant). While a supernova is a relatively quick event in stellar time, for us humans it still takes a few days at least to fade away, if not weeks.
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