That is a fantastic question, because the mistake many candidates make is chasing raw quantity. There is no magic optimal number, but there are critical preparation phases tied directly to how the recruiting machine evaluates readiness.
Before you submit your application, you should aim for 3 to 5 absolutely flawless, end-to-end quality reps. These need to be cases where your structure, math, and communication are perfect, preferably done with someone who has run these interviews. This initial phase isn't about volume; it's about confirming you have mastered the core mechanics and can handle the basic stress test. If you can’t nail these 5, you risk submitting an application too early and needing to wait a year to reapply.
Once you receive the interview invite, the game changes dramatically. You now need to shift into endurance and curveball testing. This is where you put in the bulk of the work—the 20 to 30 cases—working almost exclusively with alums or current consultants who know the firm's specific style (Bain often leans analytical, McKinsey communication heavy, BCG a mix). The goal here is speed, developing executive presence, and making the frameworks intuitive under high stress. If you push much beyond 35 cases, you often start sounding too rehearsed, which flags as a lack of authentic leadership communication. Focus on consistency over sheer numbers.
All the best with your prep!
