How does the final, energetic stage of a binary black hole inspiral compare in duration to a full galaxy merger?

Answer

The black hole finale may last mere seconds, while galaxy mergers take hundreds of millions of years

There is a vast disparity in timescales; a galaxy merger is temporally drawn out, taking hundreds of millions of years, whereas the final stage of a black hole inspiral can conclude in mere seconds.

How does the final, energetic stage of a binary black hole inspiral compare in duration to a full galaxy merger?

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