by the end of my employment at Google, I was working about 2 hours a day (and getting Meets Expectations at L6, which is OK but not great). While I'd be online and available to respond to chat for 8 hours, I only exerted about 2 hours and most of that was just explaining to executives just how bad our fleet was. Before that I had worked at least 6 hours a day. And I assumed that to be "right" i should be working at l…
With negative I meant that you might spend 1h to do something that will then take more than 1h to be debugged/reworked/discussed and ultimately removed.
Or something that cause breakage that could be avoided.
You need to be well rested and clear-minded to foresee a problem and take the right decision, especially around software.