How many question cards should I have for a game board project?

I am doing a project for school on the Civil War and I am making a game card. I am making cards with questions on them for the game. How many do you think I should make?How many question cards should I have for a game board project?I've done a few of these type of projects before, and 30 is usually a good number of questions if the teacher doesn't give any guidelines.

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