Hi there,

You need to get to a point where this doesn't matter at all i.e. mastery of cases and personality/fit questions. If this actually matters to you, you're not in the right mindset yet. However, let me answer your question regarding 1st round MBB format:

• Typically 2-3 interviews with integrated case + fit (except Bain recently adapted their format in some offices and separated case from fit interviews)
• Can be back to back or spread out - depending on office and candidate profile (e.g. intern recruitment from uni is often done in one day whereas interviews for experienced hires are typically spread out)

What you should spend your time and energy doing is getting really good at the interviews themselves and understand how the format differs between the firms (basically McKinsey vs. the rest of the world). 

Once you have confidence based on actual competence, you'll be unstoppable - irrespective of the format!

Best of luck!

Hello,

This will be different by firm, geography, recruiting cycle and whether you are applying from a target school or not, so it's hard to give a detailed answer that will be true universally. Most generally, first rounds typically involve 2 interviews (sometimes back-to-back, sometimes not). Usually, each will involve one case and some behavioral questions. Hope that helps!