As someone who shares this perception, for me it's not nearly as analytical. I can physically see how much is left; I don't think in terms of the numbers. It's

As someone who shares this perception, for me it's not nearly as analytical. I can physically see how much is left; I don't think in terms of the numbers. It's sort of like judging the distance between your workplace and the coffee shop down the street, in which if asked you'd make some heuristics to estimate how long it takes you to get there, but by default you just 'know' it is where it is, even if you don't think of the distance in meters. So it's more like "I have <image of clock> left" because I intuitively know what the clock will look like when the time is up.