10 HBU's = how many IBU's?

This is NOT a political discussion, so all the trolls get the hell out.
Obama's WH Honey Porter Recipe calls for "10 HBUs bittering hops". How many IBU's is 10 HBU's?

I believe it was probably a misprint but could be wrong.

HBU is a Papazian thing = Home Bitterness Units.

It's %AA x Ounces. E.g., 5% AA x 2oz = 10 HBU

You'd need the boil time to figure out the IBU

HBU is "Homebrew bittering units". Multiply AA% by amount ex: 2 oz of 5% AA = 10 HBU.

Here is what i have found.
HBU ( Home Bittering Units)

For a Five Gallon Batch- Multiply the ounces of hops used for Bittering by there Alpha Acid Number. For Example: 2 ounces of Kent Golding Hops at 5% apha acid per ounce equals 10 HBU or 2oz. times 5 %(AAU) = 10 HBU

IBU ( International Bittering Units) To calculate Total IBU's from per gallon AAU's, first determine the approximate efficiency of hops isomerization. Hops boiled for 50 to 60 minuted will have 30% of the alpha acid converted. Hops boiled for 30 minutes will have 21% of the alpha acid converted. Hops boiled for 5 minutes will have 10% of the alpha acid converted.

also there is a calculator herehttp://www.djmphotography.com/www/Brewing/Homebrewing/Applets/Hops.html

An hbu or homebrewer unit is the weight of the hop addition multiplied by the alpha acid

Thank you'all!!!

Hey Scooby, what did you go with and how did it turn out? I'm thinking about trying out that recipe soon...