noun
how many times; how often
Asks about the number of occurrences or repetitions. Often used with verbs of action or experience.
この映画は何遍見ても面白い。
This movie is interesting no matter how many times I watch it.
東京には何遍行ったことがありますか
How many times have you been to Tokyo?
何回 is the most common and neutral way to ask 'how many times'. 何遍 is slightly more emphatic or literary, often implying repeated attempts or experiences.
何度 is also common and can ask about both frequency and degree (e.g., temperature). 何遍 is limited to counting occurrences.
Compound of 何 (nan, 'what') and the counter 遍 (ben, 'times' or 'occurrences'). The counter 遍 is used for repetitions of an action.