Depends on whether you mean in a moment (ie, an epiphany) or over time. I've changed my time over time, but don't recall a single time when I completely changed it.
There's a few issues to completely changing your mind.
One is that when you say something to others, you confirm it for yourself and you want to be consistant with yourself. That is, it's difficult to change your mind because you've already identified yourself as the kind of person that is/says/believes/does x. Another thing is, if you get into a debate (even a friendly one) with someone else, you hammer in your own beliefs even more. Unless the other person is extremely skilled at the art of persuasion, it can be difficult to get someone to change their minds.
Another issue is what you're changing and how much of an impact that change can have. For example, if changing my mind meant changing my entire life, that's a more difficult change and many people run from those kinds of questions.
Yet another issue is emotions. Many people make decisions based on emotions rather than clear rationality, however, they believe that they are making those decisions or judgements using their rational mind. So, their emotions secretly hide behind their seemingly "rational" decisions. So, if/when confronted, those emotions reveal themselves, or quietly lurk behind everything they say.
Excuse me for any unintelligibility. I'm fairly tired right now.
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