Hi all, I'm along time lurker and wanted to share some info because I know not getting an interview sucks (cough GSB).
to give you some data points, I was invited for R2 (not today, the wave from earlier this week) for on-campus. I just did a rough count - there were about 15 spots/day, with 14 days available to choose from. That gives you about 210 on-campus invites. Not too sure if you can interview domestically that's not on campus, and what the number of international interview is (maybe 50-100?). If someone knows what the number of R2 applicants was last year, you might be able to see what the percentage was for R2 invite.
Not sure if this helps at all, but I hope you all have a good weekend and forget about this, best of luck with everything!