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From what I've seen, they still expire after 90 days.Yeah, if only. 13 months later still waiting on the expiration of an extremely harsh manual action (zero Google traffic although site is well-indexed)
It stands to reason that if a human evaluator decides it was your intent to cheat that they have a permanent be-gone button.
manual actions are in place for a year or more so you generally wouldn't want to 'wait it out'Waiting it out is not a good strategy anyway because the expiration of the penalty seems to be also triggered by changes on the site. In other words, a site that has just been left untouched may have the penalty expire much longer than 1 year (I've had it for 20 months once) where a site that is constantly updating and changing may come out in 6 months or less.