Rejection of an Application
You may need a second look at your CV and cover letter to improve the quality. But even if it is at a high quality, you may need someone to refer you to increase your chances.
I heard this from one of the CV screeners at BCG that they only have 1 slot to interview 10 good CVs submitted for interviews, and sometimes it all comes down to subtle nuances that make the difference.
1) Only asking current employees / alums / experts here to provide the feedback
2) You can check with HR. It's 12-24 case by case
1. yes, different reasons, depending also on the office hiring moment. Feel free to send me the CV for a feedback.
2. yes, you have usually to wait 12-18m. Things you can do to accelerate it is building a strong internal referral (e.g. with friends or ex-alumni of your universiy or your company) or attend MBB events to know the HR (always being honest about the first feedback)
Sorry to hear about your rejections! Chin up, we've all had our set backs and many applicants get into MBB through a subsequent application.
I can only echo what Antonello has advised, but would strongly suggest you get CV and cover letter feedback from an expert (happy to chat!). A lot of CV fixes are around structure rather than content, understanding that HR read a very large volume of these and find some formats easier to pick out important information from than others.
as for your first question, it would be necessary to take a look at your CV and Cover. If you have not applied via referral, that could have also weakened the application. I would suggest to work with a consultant or expert that can help you on CV, Cover and referrals, please feel free to PM me in case that's interesting for you.
As for your second question, the ban is usually 24 months, occasionally it can be reduced to less (18, 12 or even 6 months).