yes whats important to remember is that the tannines (brown colouring in the water) will not harm fish in the slightest, so the only reason you need to get rid of it before adding it to the tank is if your preference is for totally clear water. I've seen really beautiful tanks with tannine stained water before, so it's really personal rpeference.
having said that the length of soaking time needed is very varied, i've had wood before and added it straight to the tank and seen no tannines at all, i've had pieces which only need a week or so of soaking before the water is clear and i've had one piece which i attempted to get the tannines out of several times, it had a good couple of months of soaking and was still leeching tannines. in the end i gave up and stuck it in the tank as it was, took around 6 months before the water came clear.
So if you want rid of the tannines then pop it in a bucket of water, change the water every day, when the water stays clear over 24hrs or so then it's good to go. could be a day a week a month or longer!