夜や分ぶん

noun, adverb

evening; night; nighttime

A somewhat formal or polite word for evening or nighttime, often used in set phrases like 夜分遅くに (late at night) or in business contexts.

• 夜や分ぶん遅おそくにすみません。

  I'm sorry for calling so late at night.

• 夜や分ぶんに失しつ礼れいします。

  Excuse me for disturbing you at this hour.