百ひゃく日にち

noun

hundred days; lengthy time

Literally 100 days; often used figuratively to mean a long period of time, especially in set phrases like 百日の説法屁一つ (a single fart ruins a hundred days of preaching).

• 百ひゃく日にち間かん、毎まい日にち練れん習しゅうを続つづけた。

  I continued practicing every day for a hundred days.

• 百ひゃく日にちの苦く労ろうが水みずの泡あわになった。

  A hundred days of hard work came to nothing.