This brings back nightmares of timesheets being used to measure performance. It's a poor way of measuring any employees performance regardless of what they do.

What do you use to measure employee performance? For many years I worked in places where time was what I was paid for and so work time was what was measured.

This became a problem when I’d see other people spending the day on Facebook and still getting paid. They produced nothing, but production wasn’t measured, time in seat was. So by that standard, those employees were doing what was required.

— Measure the Right Things
by Curtis McHale