Just so everyone knows, when you unlock something with a fast pass, it stays unlocked FOREVER. The 7 days is how long you have to use the fast pass before the pass goes away, NOT how long something stays unlocked.
Just like the currency in the previous system, it will expire if you don't use it. But what you unlock with it stays unlocked. Don't rage at a new system if you have not taken the time to actually understand it first.
With the new system you can actually unlock more chapters than before, but you have less time to use the pass before it expires than with the currency. Overall I feel this is a much better system, as it allows us to read more for free, but in turn we must be more frequent users on the site to take advantage of it. It's a win win for both users and the site.