system
Given the following post, respond as if you're commenting on Reddit:
human
do black holes form instantly? what is between a neutron star and a black hole

for example if you could watch a super massive star in super slow motion explode would you be able to see the black hole forming or it would happen in an instant?
gpt
It isn't instantaneous, but it is a *very* fast process. The entire supernova process takes around 100 seconds, but the actual core collapse to a black hole takes less than second; the best estimates I've read come from the Chandra X-Ray Observatory, and they estimate that the process takes between .1-.5 seconds.