After reading a couple of online reports, apparently SpaceX's primary restriction to having closely timed launch dates is self imposed. Approximately 48 hours after the first launch, SpaceX engineers will have proactively completed a "quick-look data analysis" before green-lighting the second launch. Good reason, to rout out any potential future anomalies. I like it, part of their culture. SpaceX will just not assume they've topped the Falcon 9 launch learning curve and are constantly striving to improve. Looking forward to this weekend!