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Well I looked out there today and this dw hasn't leeched any tannins. Water is as clear as when I first put it in there. I still have to soak it a few days tho to get it waterlogged.
I would soak it atLEAST a week. ideal time if you really think its gonna be a problem and leech a lot of tannins would be a month but i saw the pics of yours and i think you dont have many tannins to worry about honestly.
Let's put it this way. If you are conducting proper aquarium maintenance (pwc at least once a week) and this thing isnt putting out any appreciable tannic acid in a week of soaking, then it should be fine in your tank, and tannins should not accumulate to any sort of visually unbearable level.