How long do you bake your baking soda for?

[asylumdown]

I've always gone by the guidelines in this article:
http://www.reefkeeping.com/issues/2006-02/rhf/

I'm pretty sure it was written by Randy Holmes-Farley, and it suggests baking at 300 for an hour, though he states that over-heating in terms of either temperature or time doesn't do any harm, but it doesn't do any good either.