Mine were 14 minutes apart but I was pushing without an urge for the second twin due to a hand presentation. It would have likely been a longer break between babies if I had been able to wait for the urge.
Heather, Army wife & Mama to M (10), J (9), L & S (my HBAC babies are 7!), N & R (5), and A (born 11/30/12 UBA2C)
One hour and eleven minutes seperates my boys. There was an internal version done during this time. My husband says the version took about 45 minutes I have no recollection or understanding of time at that point. It only seemed like about 15 minutes.