I also think that's pushing it, especially since the show can last longer than 30 minutes, depending on who's in the hotseat. They try to end the show after a contestant has bombed out. The thing you need to consider though, is the fact that the show times change every week, and there may not be a 12:10 pm show! For instance, this Sat. there are shows at 11:40 am and 12:35 pm. That could be to your advantage if the show is before noon.
Have fun and good luck!