It’s a surprisingly useless skill in the modern day if you have a digital watch. Most people just use their phone or a smart watch and those show time with plain digits so there’s no interpretation. I forgot how to read an analogue clock face for the longest time, bought a classic watch recently and have picked up the skill again but if I didn’t then I’d never use it and I’d forget it again. Despite what some people think not all skills are unforgettable, it’s just a matter of how useful it is day to day over a long period.