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Depends on the trainer and if you both calibrate each time you ride or one of you does or you both do. If it's only you that bothers to calibrate then you're golden. If you're both doing it then it's going to change around a bit. For tyre on turbos (Computrainer) I just got into the habit of doing 10min warmup and then doing a calibration.
How anal do you get about calibration?
My wife and I share the same trainer, with different bikes, so obviously they are getting switched around a lot.
I try to make an effort to adjust the contact point as close to what is was before, and keep my tires pumped up, etc - but of course there will be minor differences.
I don't care about a few percent here or there, but obviously I don't want to be 10 or 20% over/under reporting my wattage.