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Google·Product Manager·Technical Phone Screen·Senior

SeniorPrefer not to say
May 2026

Summary

Got a classic estimation question at Google, the kind where there's no right answer but you can absolutely give a wrong one. Short round, one question, left feeling like I either nailed the structure or completely missed what they were probing for.

Questions Asked (1)

Q1

Estimate the total time wasted in meetings across the US each year.

Product Analytics & MetricsAdaptability & Ambiguity
Author's notes

My first instinct was to just start multiplying numbers, which is exactly the wrong move.

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AI HintsAI Generated

Suggested Approach

Break down the problem into the number of meetings, average attendees, and average meeting duration, then estimate the total person-hours wasted. Use reasonable assumptions and round numbers to simplify calculations, and clearly state your assumptions.

Pro tip: Define what 'wasted' means—e.g., meetings perceived as unproductive—and acknowledge that not all meeting time is wasted; this shows nuanced thinking. Also, segment by meeting type (e.g., status updates vs. decision-making) to add depth.

1. Clarify the scope and definition

Define what 'wasted time' means (e.g., unproductive meetings) and whether to include all meetings or specific types. Confirm if the estimate should be in person-hours or total hours.

2. Estimate the number of meetings per year

Calculate the total number of meetings by estimating the number of knowledge workers, average meetings per week per worker, and weeks worked per year.

3. Estimate average attendees and duration

Determine the average number of attendees per meeting and the average meeting length in hours. Use ranges if uncertain.

4. Calculate total person-hours and apply waste factor

Multiply meetings × attendees × duration to get total person-hours. Then apply a waste percentage (e.g., 30-50%) based on research or assumptions.

5. Sanity-check and present the final estimate

Validate the number against known benchmarks (e.g., total work hours) and present the final estimate with clear assumptions and confidence level.

Key Points to Mention

  • Assumptions: number of knowledge workers in the US, average meetings per week, average attendees, average duration.
  • Definition of 'wasted': unproductive meetings, multitasking, or meetings that could be emails.
  • Use of benchmarks: studies like Harvard Business Review or Microsoft research on meeting waste.
  • Segmentation: different meeting types (status, decision, brainstorming) have different waste rates.
  • Calculation: total person-hours wasted = (meetings/year) × (attendees) × (duration) × (waste factor).
  • Sanity check: compare to total working hours (e.g., 40 hours/week × 50 weeks × 100M workers).

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.