Well, I usually let it soak in that water ( because even as it cools, it will still be hotter than tap) and keep adding as the pots are coming to a boil. A couple hours is enough. I've tried putting smaller pieces in the oven, too, but that caused a small fire.
Wood in the oven caused a fire? Huh, didn't see that coming! Just bustin your balls, Dave, I can't honestly say I wouldn't try that myself!
I like your pouring boiling water idea, I'll do that. Thanks!