Our biological OS is not built for dealing with time. 1. We suck with memory. We re-write memory every time we recall. 2. We suck with delayed gratification.

Our biological OS is not built for dealing with time. 1. We suck with memory. We re-write memory every time we recall. 2. We suck with delayed gratification. No other animal had to invest. We haven't evolved past that. 3. We suck with time estimates. The engineering trope of "3x the amount of time you think the project would take" illustrates this point. There is something in Pragmatic Programmer, too. That is why we need calendars, planners, and timers. People who rely on their conception of time are ignoring the limits of their underlying OS.