I have a question about Citibike's annual membership:

Seems like $149.00 gets you unlimited 45 minute rides, but can you stack them? Or is there a cool down period? What I mean is if you are coming up on your 45 minute limit, can you dock the bike, then grab another one and use that free for another 45 minutes, and so on? I would assume the answer is no, so that brings up the next question: If you can't stack your 45-minue free rides in this fashion, what is the cool down period? Is it one free 45 minute ride in a 24 hour period or every few hours?