You can either try to time the top, which is almost impossible, or you can sell in stages. For instance, you could sell half when it doubles. At that point, you are in it for free and playing with house money. Then, you can either hold forever or sell when you believe it isn't going higher, without fear of losing your shirt. You could also sell your remaining shares at predetermined stages. There are lots of ways to play it and you might research stock trading strategies. There is plenty of time to do it.
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