I gave up wrist watches back in the late 90's when carrying a cellphone with automatic carrier time became a new sort of norm. I just wanted to shed accessories

I gave up wrist watches back in the late 90's when carrying a cellphone with automatic carrier time became a new sort of norm. I just wanted to shed accessories and check pockets for one less thing before heading out the door. Later on, maybe by 2010, I had noticed that as my aversion to blackberry vibrations emerged, and I avoided my work-related cellphone more and more, I got really good at ballparking the time to within a margin of maybe two minutes, give or take. Basically by now, somehow, I'm able to glance at a known clock with an accurate reading (or with a known offset to the accurate time), catch the time once, and usually remain pretty accurate for the next handful of hours, until I get stuck in a sufficiently distracting situation that demands concentration. Up until that point, I try to guess the time to the minute before looking, then look, and often, I'm right on. I don't have any special method beyond that though. It's just a gut feeling I've accidentally developed. I think it started when I disabled rings and vibrations for email alerts and I'd (with an amount of dread) try to guestimate how many emails would drop before the next time I checked my phone, and the minutes since my last look. I think the next level up, beyond this skill is memorizing relevant time zones and major cities in each, but I haven't been pushed into caring about something like that quite yet.