it's an effect that's very hard to describe - john: "hey jim did you notice that last second was longer" it's very personal, if jim was not looking or already looking at the timer from before john's assertion would just sound absurd and it also require being attentive enough to the clock and the sense of time in general.

and personally I kinda had a general feeling that could be at best described as 'the first second of a timer always look longer than the others' which roughly matches what magnio said, and that was it, it's not something I'd widely share unprompted, people already think I'm enough of a nerd as it stands.

I asked my parents once about the eye floaters but they didn't seem to get what it is, so I just assumed it's only me.

Granted, as a kid I had this egotistical sense of self, to which I attributed a number of misconceptions about lots of things.

You might be interested in the concept of qualia [0]

Vsauce did a good video on it, "Is Your Red The Same as My Red?" [1]

0: https://en.wikipedia.org/wiki/Qualia

1: https://www.youtube.com/watch?v=evQsOFQju08