I personally would choose earlier than later if its an option, but I have no clue how schools feel about changing of dates. Tbh, I don't think you need more than a weekend to prepare for interviews (you already know your values, but re-read their's to ensure you are prepared for a "why us", practice practice questions out loud in front of a mirror or web cam, etc). This is my opinion of course, but I feel that I would just end up overthinking it more if I waited. Good luck!received my first II from here earlier this week, when I went to sign up the only interview dates available was the day after i received the invitation and later in January so signed up for the later one in January because I have not practiced/prepared at all for an interview yet. Went back into the portal and looks like an earlier date in mid Dec is now available. Should I see if i can change the date or take more time to prepare? Want the best odds for my application but know the later you interview the less spots