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How often??. As often as you have to, and is necessary. It all depends on how well your mirror has been setup in the first place. It may need collimation every time you use it, or it may not need it for a month of two. But I would suggest that any time you have to move your scope about or it takes a bump, knock, whatever, that you check the mirror's alignment and then adjust it accordingly. It might only need the slightest of tweaks, or a good general re-alignment.
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