Unsubscribe Me Madness

For some reason I was getting marketing email from Barnes & Noble,
several times per day. I must have inadvertently missed a checkbox
labeled 'spam me' during my last online purchase. Anyway, I finally
followed the 'unsubscribe' link and dutifully selected that I no
longer wished to receive ANY email. This is the response I got after
submission:

"Your request to [Modify / Unsubscribe] your email has been
successful. Please note that this change will take effect within 10
business days."

10 business days? Really (not even 10 days - 10 BUSINESS days)? So
flipping a database flag in my user account takes up to two weeks?
Must be a very inefficient database. Funny how when you make a
purchase, they charge your credit card within seconds. I would love
to see this message instead after buying something online:

"Your purchase has been successful. Please note that you will see
this purchase charged to your credit card within 10 business days."