Superdays are mostly bunch of interviews lined up during the day. You may or may not have some networking events at the end. Most of the interviews are 1-1.5 hr long. The interview questions mostly vary, I have seen it vary based on your resume and profile. Tech background gets more technical Qs, business/finance background get more of financial Qs. But it will be some what intensive since you will be basically moving between rooms or sometime diffferent buildings to meet with the interviewers.