Tangent: Way back when I was in Scouts, the scout master was a USN missile submarine captain. He was a quirky guy, not the least of which was his ability to schedule things to ridiculous levels of detail... cross-country trip to go backpacking, and he'd have a lunch stop at 13:14, gas stop at 17:29, on base (we would stay in open barracks at military bases across the country) by 16:09. And wouldn't you know it... we were usually within a few minutes either way. And he managed to pack a lot of side-trips/value into the days we were on the road. It was really wild.

I would never suggest people join the military to learn how to run a schedule correctly, but I will say that it's hard to find someone who was in the military - and borderline impossible to find someone who was senior in the military, especially a senior NCO - who is habitually late.

I once did an international camping and backpacking trip like this where we had everything down to a minute.

The key is to check your watch after you complete any activity. For example, you read that a 1000ft climb hike takes 2 hours and you do it in 2.5 hours.

Do this over months and you gain the ability to make perfect estimates. Turns out that feedback loops are useful.

Also applies to all other skills.

Funny thing is I’m mostly a buy tickets to fly next week and wing it kind of person but I wanted to try it one time for kicks. Winging it is a whole different set of skills. Get good at both and planning becomes your jam.