いつまでも
endlessly, as long as one likes
No end date on it anywhere, which is the whole of the promise. It is two いつ now, and it will still be two when you are a hundred: いつまでも.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.