until one is blue in the face

Adverb

idiomatic

(duration, idiomatic) For a hopelessly long time; used especially in respect to discussing, explaining, insisting, etc.

Japanese Meaning

絶望的なほど長い時間、つまりどれだけ説明や議論を続けても効果が現れない様子を表すイディオム。 / 話し尽くすまで、根気よく説明し続けても変わらない結果を示す表現。 / 努力や説得をどれだけ繰り返しても、事態が改善しない、または成果が得られない状態を表す。

You can argue until one is blue in the face, but she'll never change her mind.

どれだけ長時間議論しても、彼女の考えは決して変わらない。

Sense（1）

(duration, idiomatic) For a hopelessly long time; used especially in respect to discussing, explaining, insisting, etc.

You can explain it until you're blue in the face, but he will never understand.