This isn't traditional shift work; in shift work you shift by 8 hours all at once, and then it takes ~5 days for bodily hormones to adjust. Shifting by 2 hours a day has less of an obvious problem. Do you have a source for that 10 minutes claim? IIRC the body's natural cycle in the absence of external cues tends to be ~25 hours, so I would expect the "no jetlag shift" to be asymmetric.
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