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

How long does the initial explosion take? One second? One minute? One hour? Several years? Also, how long does it take for a supernova to become a neutron star/black hole.
gpt
Once the nickel/iron core of the star exceeds the Chandrasekhar limit (~1.4 solar masses) electron degeneracy can no longer support it against gravity: it becomes energetically favourable for electrons and protons to undergo inverse beta decay to form neutrons (and neutrinos), leading to a cataclysmic implosion of the core.  The implosion and initial formation of a neutron star takes roughly of 1/4 second.