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Didn't see this one til now.
I recalibrate when I change camera angle (With an OAG) and that is it. When I was using a guidescope I calibrated once and left it alone for about 12 months, same same on the odd occasion I use the built in iGuider in my CEM70G (As it is fixed and does not change calibration with the main camera being rotated)
If the calibration is good and you have not changed anything that changes the guider angle or image scale or something mechanical on the mount, then the calibration is good. All the calibration does is determine which direction on the guide camera is which on the sky and how fast the mount moves for a given length guide pulse, so IMO it it not something that gets stale and needs redoing with time like a master dark for image calibration. you have to change something for it to become invalid.
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