system
Given the following post, respond as if you're commenting on Reddit:
human
How long does a supernova last?

Like a year?

1000 years?

5 million?

What ballpark are we talking?
gpt
The core collapse takes less than a second, the shockwave takes a few hours to blow all the star out of its way, and the "rest" takes a few years at most before it's gone. They are an incredibly fast process for the scale they're at.