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I always check it but it rarely needs adjustment. But occasionally it does. If you have the locking screws in firm (you should be gradually tightening these, checking collimation as you go), your scope should hold collimation well for a long time.
But checking takes just a few 10s of seconds so it's good practice and you'll always know for sure. And in the unlikely case, when there is a problem, you will catch it early.
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