after what seemed an age

• after what seemed an age: ずいぶん長く感じられる時間が過ぎた後

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• After what seemed an age, she turned and left.
  （どれだけ時間が経っただろう、ようやくミセス・ノリスは向きを変えてどこかへ行った。）
  J. K. Rawling, Harry Potter and the Philosopher's Stone, Bloomsbury, p. 155