The maximum you can withdraw at once is the amount of gold that you collect in 24hrs. Example; Say you make 1000 Gold/day and you wait 3 days until you have 3000 Gold collected then withdraw, you will withdraw 1000 Gold and the remaining 2000 Gold will stay as gold collected that you can either use or withdraw again with taxes. This will ensure that the taxes aren't avoidable by waiting without compounding then withdrawing all of the gold collected.