adverb
for many days; for days on end
Emphasizes that something continues or lasts over a period of many days, often with a sense of duration or repetition. Commonly used with negative expressions or verbs indicating continuation.
幾日も雨が降り続いた。
It rained for many days on end.
彼は幾日も家に帰らなかった。
He didn't come home for days.