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I can attest external factors have a massive influence.
I think it being personal is also a very good point.I know some people come off the back of a Grand Tour and then crush races after 1 week easy. Where as other needs a few months, and then will crush races. Depending upon how they reached to the huge load.
I know a study might not apply to me, but it would be good to do some more reading on what are the influencing factors in the body behind the rebound from a big load into good form.
From a general exercise science perspective, the answer is "it depends on individual circumstances". Essentially, the more well-trained you are, the more training stress you have to apply to enact change and the longer a rest/taper needs to be to reap the supercompensation. Outside stress factors will likely play a big role too (e.g. a study on pro athletes would be different to highly-trained individuals who work 50+ hours a week. Or a bunch of untrained students, like the majority of studies).
What I mean is, what you read in a study probably won't apply to you. If you've found 2 weeks on, 1-2 weeks off works for you then that's what you've shown works.