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Case Study: The Consultant Who Discovered She Was Only 12% Billable

April 4, 2026·4 min read

Diane is an independent management consultant, three years into running her own practice after leaving a large firm. She was working fifty-hour weeks and had no shortage of effort. But her revenue had plateaued at a level that didn't match how hard she felt she was working, and she couldn't identify the disconnect.

The Layer Setup

She set up four layers to match the structure of her practice: Billable Client Work (cobalt), Business Development (amber), Non-Billable Prep (green), Admin (purple). The categories mattered here — the distinction between 'billable work' and 'prep for billable work' turned out to be the entire story.

Two Weeks of Data

After two weeks of tracked time, the numbers were: 12% Billable Client Work, 8% Business Development, 41% Non-Billable Prep, 39% Admin.

12% billable. In a fifty-hour week, that's six hours of work she could actually invoice for.

The shock wasn't just the 12%. It was the 41% prep. Nearly half her working hours were going into proposal drafting, background research, pre-engagement calls, and meeting prep — and almost none of it was translating into proportionally higher close rates or better engagement outcomes.

The Diagnosis

She did a manual audit of her prep hours. The pattern: she was over-preparing proposals (average 6 hours per proposal, most of which wasn't being read), spending too much time on pre-engagement research before a deal was confirmed, and taking prep calls that weren't necessary for most prospects.

The prep wasn't making her work better. It was a displacement activity — it felt productive, it looked like work, but it wasn't billable and it wasn't substantially improving outcomes.

The Changes and the Results

She made two structural changes: built proposal templates that capped proposal prep at two hours, and set a rule that deep pre-engagement research wouldn't begin until a prospect had confirmed intent to move forward. She also set a maximum prep ratio — no more than one hour of prep for every hour of billable work.

Three months later, billable hours had risen from 12% to 31% of total working time. Her revenue followed. She wasn't working more hours — she'd eliminated the prep work that wasn't moving outcomes and redirected that time toward actual client delivery.