expression
how much; how many; to what extent
Used to ask about quantity, degree, or extent. Can also be used in exclamatory or rhetorical expressions.
どれだけ待てばいいですか。
How long do I have to wait?
どれだけ練習しても上手になれない。
No matter how much I practice, I can't get better.
どれだけの人が来るか分からない。
I don't know how many people will come.