How long does silicon fusion typically last in the core of a very massive star?

Answer

Only days

The later stages of fusion in the core of the most massive stars, as they progress through burning successively heavier elements, are incredibly rapid compared to the main sequence hydrogen burning phase. After fusing lighter elements like helium, carbon, and neon, the star advances to silicon fusion. This specific stage, just before the catastrophic final collapse, is extremely brief, lasting only a matter of days. This acceleration highlights the instability of the core when it reaches the point where fusion produces elements that yield diminishing energy returns, culminating in iron, which consumes energy rather than releasing it, leading to immediate pressure failure.

How long does silicon fusion typically last in the core of a very massive star?

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