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I can't remove a vote I made on an answer because 'I last voted 6 min ago'. Do you think this is enough time? people always change their opinion about things, there should be a longer time for rethinking the vote.
Yes, I think it is enough time. You should make up your mind first and vote only then. If you cannot make up your mind, do not vote.
Note also that if the post should change, then you could in fact change your vote.