depending on the size of the dirftwood you can boil it for a few minutes or if its larger you can get a trashcan a 35 gallon one and fill it up half and put it in there for a week or so.
It also depends on how badly tannins are leaching out. I boil typically for 15-20 minutes and if a lot of tannins are present, will empty pot add fresh water and repeat until water remains fairly clear.
Be careful when boiling,if its a small piece only for a couple of minutes and it is better to get the water boiled first then add,i have mine sitting in a pale with some peroxide soaking.I couldn't boil the piece because the piece was to large
How long do you boil driftwood? 
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