Doesn’t a black hole stretch time in a really weird manner? That would mean that no sensible answer can be given to the question. It could easily be that it takes either one billionth of a second or a trillion years, depending on where you are standing when observing the occurrence.

I think twelve.

At the event-horizon, you’re moving at the speed of light.

So, you can’t have any awareness of duration, anymore.

You slam into the black-hole, from your perspective, instantaneously, then.

No machine could be “fast enough” to notice any duration pass by, between the event-horizon & the smashing-to-strings/quarks/whatever.

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