Tax Lien Investing

I was curious.I recently inherited a property that has more unpaid taxes, penalties and interest than the land is worth. I know during these rough economic times that the property will get auctioned off, and I figure there will be a judgment soon after for the difference of the final sale price and all the fees and expenses. I understand that part.

I keep hearing conflicting details. Most focus on the credit bureaus which I understand is seven years, but then I also hear 10 years.

I am really curious how long they can keep a judgment on me, say if I want to buy or sell any property 10 or 15 years from now, does the judgment lien stay on forever until paid, or does that disappear after time?
I did a little more research, and the tops taxes can stay is 20 years. After that time, the tax authority has to give it up.

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