I'm really bad at loosing track of time when I get on the computer. I find setting a 20 minute timer really helps with this. I do have a egg timer, but just asking my phone "ok google set timer for 20 minutes" works too.

Interesting that they mentioned body weight effects this, there was and article the other day on HN, showing how obesity contributes to brain activity decline.

Apparently overweight/obese people's brains don't work as well as they could, if they were skinnier.

Marcus Aurelius had a lot of insight on human perception of time actually.

“Never let the future disturb you. You will meet it, if you have to, with the same weapons of reason which today arm you against the present.”

"Time is a sort of river of passing events, and strong is its current; no sooner is a thing brought to sight than it is swept by and another takes its place, and this too will be swept away. "