Accumulated Exhaustion or Fatigue Built Up?

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Jun 28th 2011 04:09
I want to say some expression "피로가 쌓이다" but don't know how in English ㅠㅠ.
Let's say someone work everyday without day-off for long periods.
In first place, he did't feel exhausted. but as time goes on, the more he works the more he feels tired.
How can I say this?

어떤 표현(피로가 쌓이다)을 쓰고 싶은데 영어로 모르겠군요.
만약에 어떤 사람이 휴일없이 오랫동안 매일 일한다고 해요.
처음에는 피로를 못느끼지만 시간이 지나, 일을 하면 할 수록, 더욱 피곤해지는 상황이에요.
뭐라고 해야 하나요

His physical exhaustion has been accumulated?
His fatigue has been built up?