a great many; ever so many
Emphasizes a large, indefinite number; often used in affirmative statements.
彼はいくつでも質問に答えた。
He answered a great many questions.
any number; as many as you like; no matter how many
Used with expressions like よい, 構わない, or in contexts of permission or indifference to quantity.
いくつでも好きなだけ取ってください。
Please take as many as you like.
Any number is fine.