成年累月 (chéng nián léi) — year in, year out; for years on end (emphasizing continuous duration)

Definition

Examples

• 他成年累月在工地上干活，非常辛苦。
  Tā chéng nián léi zài gōng dì shàng gàn huó, fēi cháng xīn kǔ.
  He works on the construction site year in, year out — it's very hard.
• 成年累月的劳累让他的身体越来越差了。
  chéng nián léi De láo lèi ràng tā de shēn tǐ yuè lái yuè chà le.
  The exhaustion from years on end has made his health worse and worse.
• 她成年累月坚持写作，终于出版了第一本书。
  Tā chéng nián léi jiān chí xiě zuò, zhōng yú chū bǎn le dì yī běn shū.
  She persisted in writing year after year and finally published her first book.