"Man hours" refers to the total amount of time spent by one person on a particular task or project. It is used to measure the effort or work contributed by an individual in terms of hours. Full definition
Along with an image showing the thousands of bespoke parts that make up the prototype, the footage provides an idea of the many man hours required to develop such a vehicle. (evo.co.uk)
We have them call us to confirm to make them responsible day one, and to avoid wasted man hours for our property management staff. (biggerpockets.com)
Enough man hours have been spent on setting up this site so your life could be made easier. (factsonhgh.com)