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We have leap seconds to save us from having leap minutes, or leap hours.

Generally, it's useful for midnight to be at night, and midday during the day. UT1 is not regular, so you need some form of correction. Then the debate is about how big and how often.

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It’s going to be multiple centuries until the cumulative leap seconds add up to 30 minutes, and by that point, a majority of the human population is likely to be living off the earth anyway.

You don't need leap minutes. Nobody cares if the sun is off by minutes, it already is anyways thanks to timezones. You don't even need leap hours. If in seven thousand years no-one has done a 1 time correction, you can just move the timezones over 1 space, like computers do all the time for political reasons.

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