I was under the impression you should boil your driftwood. I boiled mine and then let it soak for a few days and it was good to go. If you're not going to boil or sterilize in any other way, I'd say if it's not leaching in the tub you have it in now then it's ready to go.
Platys, Tetras, Mollies, Bettas, BN Plecos
Red Eared Slider