PM Communication Time
This isn't a calculation so much as a widely accepted rule of thumb: a project manager spends about 90% of their working time communicating. "Communicating" here means everything from writing emails and reports to running meetings, giving updates, listening to concerns, and having quick hallway chats.
There's nothing to compute — the 90% figure is meant to shift how you think about the job. Many people new to project management assume the role is mostly about charts, schedules, and budgets. In reality, those tools exist to support the real work: making sure the right information reaches the right people at the right time.
A project manager keeps this figure in mind when planning their day and their skills development. It tells you that clear speaking, careful writing, and active listening aren't "soft extras" — they are the core of the job. If communication breaks down, the project usually does too.
Think of it like being the conductor of an orchestra. The conductor doesn't play an instrument during the concert — almost all their time goes into signaling, guiding, and keeping everyone in sync so the music comes together.
Suppose a project manager works a typical 40-hour week. Applying the 90% guideline: 40 hours × 0.90 = 36 hours spent communicating in some form. That leaves only about 4 hours for everything else, like updating a schedule alone at their desk. Seeing it this way helps a new manager realize they should invest heavily in becoming a strong, clear communicator.
Every PMP formula explained free — plus worked examples and practice in PMP Math, and full timed mocks in the simulator.