Nobody is saying it's always 30. Other times took you longer, 5 days is pretty dang lucky but it's not something to count on or you would be clean every time in 5 days. You readily admit you have taken longer. 30 days is just an average. It can take more or it can take less but nobody ever said it takes exactly 30 days so no it "ain't" always 30 days.
This thread is so done. Just because you don't agree with one post Do Not disagree with all posts, that is ignorant.