First thought: I'm moving this to the proper forum. The Ticket Request/Taping Meetings forum has sort of become a catch-all for threads relating to making the pilgrimage to The Bob Barker Studio in person.
Second thought: Don't count on being able to do it, especially if you're going this month. The only way you can make the second taping is if it, for whatever reason, is short on audience members and they need to invite the first audience back to fill the remaining seats. Consider it a nice bonus if it does happen, but don't count on it.
(Oh, and if you should hear the staff make an announcement at the end of the first taping that sounds like it will be 'We happen to have seats still available for the 4pm taping'...do not stand in place to hear it. RUN to the door while everyone else's head is turned!)