In my world, we do lots of estimating and I wonder why when I see a header in a spreadsheet that says "actual hours" for a card/task/project my feathers are ruffled.
I think it's because my first love is mathematics and in that world, there is no guessing. It either is or isn't. Coming from that world and seeing actual hours leads me to think of the impossiblity of the accuracy of that data.
No one is using a timer to get the task done and even if they are, they are seldom working just on that one thing the entire time. Think about having to use the restroom during said exercise; you'd now be required to track the time of two things: your project and your time away using the restroom. We're not timing the projects/tasks very well - if at all - to begin with, so what makes us think we can time two things or one thing with an interrupt any better?
Keeping track of actual hours just seems to be an exercise in futility or a grand waste of time.
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