adverb, noun which may take the genitive case particle 'no'
many times; time and time again; repeatedly
Used to emphasize that an action or event has occurred many times, often with a nuance of persistence or frequency. Can modify verbs directly as an adverb or nouns with の.
See also: 何度も (なんども)
彼には何回も注意したが、全然聞いてくれない。
I've warned him many times, but he never listens.
この映画は何回も見たくなる。
This movie makes you want to watch it again and again.