Comment by Jensson

> I am typically energy constrained rather than time constrained, as I imagine is the case for many working in engineering/science.

I've found that being energy constrained is much easier to track than time constrained. You notice instantly when a task takes a ton of your energy, you start hating the task so you work hard to ensure you don't have to do the task any more. Compare that to someone who mostly wastes time, they'd happily sit and waste tons of time every day since you don't really feel your time slip away.