When a guy asks a girl to be his girlfriend how long does she realistically have to answer?

An old friend asked me to be his girlfriend Thursday night. I have feelings for him, but if I say yes it'd devastate my best friend, and that's the last thing I want to do.

How long do I have to figure this out or is it too late already?

When a guy asks a girl to be his girlfriend how long does she realistically have to answer?
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