From the onset of iron burning in a massive star's core to the catastrophic rebound explosion, approximately how long does the final collapse take?

Answer

Minutes

When the inert iron core forms and loses pressure support, gravity wins, leading to core collapse. The entire process from iron burning onset to rebound is estimated to take just minutes.

From the onset of iron burning in a massive star's core to the catastrophic rebound explosion, approximately how long does the final collapse take?
evolutionlife cyclestarmass