Used to ask about the number of occurrences or repetitions. Often followed by a counter or verb.
この映画を何回見ましたか。
How many times have you seen this movie?
何回も練習すれば上手になるよ。
If you practice many times, you'll get better.
Is this our first, second... date? Which number is this?
How many times do I have to tell you before you get it?