Don't think too much! My friend's 1st in was really late and her girl's 2nd in is also on the last day. My girl's 1st in was very early and her 2nd in is on 12/11.
I can't say for sure but my friend's daughter and my daughter had 1st interview on the same day, same time slot. And now, our second interview dates are also the same, and almost the same time slot.