Hey Phil. I got the wood from manzanitadirect. They are really great. Super fast shipping and great product. They send me free product everytime.
I soaked mine for 24 hours. Dumped the water and refilled. After about 12 hours the water was still clear so i figured it was good. Last time I got my wood from them it was about the same. Only couple days soaking and very little tannin.
When I first started my tank I had a piece of mopari that I boiled. It had my water so yellow. After several days and WCs later I added some purigen to my filter. Within 24 hours water was clear.