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I'm going with '9↑↑9', which is 64 bits of UTF-8. (See https://en.wikipedia.org/wiki/Knuth's_up-arrow_notation)

This is much less than the Ackerman value ack(9,9) that is discussed in the article, which equals 2↑↑↑↑↑↑↑12 - 3.

The article's result is large than that

Awww, rats. I managed to miss seeing Knuth already mentioned in there. :facepalm: