Upon further googling I've found that the deal was struck in 2008 and was a 12 year deal. I maybe wrong. Seems like a bargain for the SportFive group since it is rumored that they have those mentioned years to find a sponsor and then after signing the sponsor onto the stadium they get 5 years of that. So theoretically it might be 16-17 year deal if they wait until the last minute to find a company. Which why wouldn't they. The Juve brand has grown immensely since the completion of the stadium and keeps going up in value. They struck a bargain of a deal when we were financially weaker.
