How much height difference is too much?

OK well I have been talking with this girl lately and we hit it off really well. we have only hung out once and it wasn't for long but I am 6'6 and she is a little under 5'0. do you think it's too much of a height difference? I don't think it should affect my decision because I am in love with her personality but what do you think?
How much height difference is too much?
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