How high is too high? (humidity)

Joined
Aug 10, 2018
Messages
63
Location (City and/or State)
Pennsylvania
How much humidity (percent wise) is too high? Mine hovers around 80%, if not 80 a few percent above. But when I mist the inside it sometimes goes to 99%. When it does this I usually crack the sliding glass door until it drops a little. Is 99% humidity too high or is it okay to leave it at that until it drops on its own?
 

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