Taking a 2 month breather doesn’t really undo the years of heavy drinking

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Nope, taking breaks during the week is much more important than taking larger blocks off. The damage tends to be something of a positive feedback loop - damage accumulates, which tends to lead to inflammation, which leads to more damage. Having time when the repair mechanisms can work before the inflammation sets in will do a lot more than a big break after that cycle has already been going for a while.