“Ninety minutes of your time can enhance the quality of your subordinate's work for two weeks, or for some eighty-plus hours.”

Why it was said

Andy Grove makes this calculation in High Output Management while arguing for the regular one-on-one between a manager and each direct report. It applies the book's central idea, managerial leverage, to a single meeting on the calendar.

What it actually means

Grove thought about a manager's time the way an engineer thinks about output. An hour and a half of attention, spent listening, asking questions and helping someone think through their own problems, shapes how that person works for the next two weeks. Few other uses of ninety minutes reach that far. The line is not about the meeting as a ritual; it is about leverage. A one-on-one that is really a status update the manager could have read in an email wastes it. One where the report sets the agenda, and the manager teaches, unblocks and learns what is actually going on, multiplies it.

How to use it

1. 1Put a recurring one-on-one with each direct report on the calendar and let them bring the agenda.
2. 2Ask what is slowing them down before asking what they have done; the first question is where the leverage sits.
3. 3When Ayşe, a team lead at a software company in Istanbul, is tempted to cancel a one-on-one to finish her own tasks, she compares the two: one afternoon of her work against two weeks of someone else's.