Case Prep With a Full-Time Job: A Realistic 6-Week Plan

Most case-prep advice quietly assumes a student with a flexible calendar. If you have a full-time job, whether you are a prospective experienced hire, an analyst planning an MBA application, or someone moving in from another field, your constraint is not motivation. It is that your best hours already belong to your employer, and by the time you sit down to practice in the evening you are tired.

This plan accepts that. It runs six weeks at about six to eight hours a week, roughly forty hours in all, which yields roughly a dozen full cases. It is a structure, not a promise of readiness: your starting point, the firms you are targeting, and how much case experience you already have all change what forty hours can do, and we cover how to adjust below. If you are coming from industry, read it alongside the lateral path post, which explains why your domain expertise is the main asset and the case is the bar you have to clear, and see the note for experienced hires under "Adjusting the plan."

How the week is built

A working week gives you scattered small windows and, at best, one large block. The plan uses both.

• Four weekday micro-drills, 20 to 40 minutes each. Each one targets a single skill you can practice without a partner: build a structure from a prompt, do a ten-minute math set, size a market, read one chart, tell one story aloud. Short sessions fit around a commute or a lunch break, and a drill that small is hard to skip.
• One long weekend session of about three hours. This is where the full cases happen: one or two forty-five minute cases with a partner, each followed by fifteen to twenty minutes of feedback, plus a short break between them.
• A short review, up to an hour. Update your log, reread the feedback, and choose next week's drills.

Four 30-minute drills are two hours. Add a three-hour weekend session and a one-hour review and you are at six hours. Stretch the drills to 40 minutes (two hours forty) and add one 45-minute partner case on a weeknight in the heavier weeks, and you reach about seven and a half. Choose the lighter version if work is heavy; the sequence matters more than the hours.

The six weeks at a glance

Week by week

Week 1: baseline and structure

Before you study anything, do one full case with a partner and record it. That recording is your baseline, and you will compare against it in week six. The rest of the week is structure: on each drill day, build one on paper in about five minutes, then say it aloud. Learn how the common case types decompose, for example profitability, market entry, and M&A, but build from the prompt in front of you rather than reciting a memorized template.

Week 2: math

Math is the most efficient skill to build in short sessions, because it is mechanical and you can do it alone. Use the weekday slots for percentage changes, growth rates, break-even, and unit conversion, drawing on the mental-math shortcuts and the worked drills, plus a few market-sizing reps. The goal is a stated approach and a clean answer at speed, not an answer alone.

Week 3: full cases with a partner

Now the weekend session becomes the center of the week. Use two different partners if you can, since every partner has habits you will start to adapt to, and pick case types you have been avoiding. The weekday openers keep the first ten minutes of a case sharp.

Week 4: exhibits and synthesis

Many candidates are weaker at the end of a case than at the beginning. On each drill day, read one chart or table and give the takeaway in sixty seconds, then deliver one closing recommendation aloud: answer first, two or three reasons, the main risk, and a next step.

Week 5: fit stories, integrated

Fit stories now join the case work. On each drill day, tell one story aloud and then cut it by a third. Use the PEI story buckets to check coverage, and tighten your why-consulting answer. If you are making a career change, prepare your "why now" explicitly.

Week 6: simulation and taper

Move the long session to the start of the week and use it to simulate an interview day: two sessions back to back, each with a fit segment and a case, with a partner you have not practiced with. Repeat a case similar to your baseline and compare your notes. After that, taper. Do light, targeted fixes for the problems your log keeps showing, test your camera and audio, and protect sleep. Do not introduce new material in the last few days.

Protecting your energy

• Put sessions in the calendar like meetings. Choose a consistent slot, early or late, and stick to it. A plan that depends on finding time will lose to work.
• Match the task to the hour. Do math sets when you are fresh. Use tired hours for low-load work such as listening to a recording of yourself or rereading your log.
• Cap the weekend session. A third case in a row while exhausted teaches sloppy habits. Stop at three hours with a break in the middle.
• Take one full day off each week. Fatigue spreads into your job and your learning.

When work travel or a bad week hits

Define a minimum week in advance: three 30-minute drills and one 45-minute case, which is two hours and fifteen minutes. On a bad week, do the minimum and nothing less. Do not skip two weeks in a row, and do not try to make up lost hours with a giant weekend; if you lose a week, repeat the week you missed and move everything back by one.

Travel has its own tricks. Voice-only drills work anywhere: dictate a structure into your phone, practice math on a flight, or tell a story aloud in a rental car. For full cases, book a video session at a time that suits both time zones, or move the long session to whichever day you are home.

Tracking progress honestly

For each full case, record the date, partner, and case type, plus a 1-to-5 score on four things: structure, math, communication, and recommendation. Ask your partner to score rather than scoring yourself, since self-scores drift with your mood. Compare week six with your week one baseline. If scores are not moving after two weeks of focused drilling on a given area, change the drill, not the effort.

Adjusting the plan

• If your baseline goes badly, repeat weeks two through four for another two or three weeks rather than shortening the plan. The middle weeks are where skill is built.
• If you have case experience, compress weeks one and two and add more full cases.
• If you are an experienced hire, swap one weekday drill each week for a domain drill from week two: explain in three minutes how your industry makes money, with three operational insights. Use one slot a week, such as part of your Sunday review, for outreach. The lateral post describes a partner-led expert round, so confirm what your firm runs.
• If partners are hard to schedule, a voice-based practice tool is one option. CaseGrade's live AI voice case interviews, for example, run on demand and score against a rubric, though you should still do some cases with people.