ADHD

Honestly I think you might be right

Since I've started my meds and some behavior changes along with them I have only been late 3 times, all traffic related. And I still managed to get stuff done those days.

Those first few weeks though were pretty damn stressful as I was suddenly finding I could manage my time.

Before getting diagnosed, the running joke was that I'd be late for my own funeral. I even joked with my family that in the event I did pass to have whoever brought my ashes to the BBQ to show up fashionably late in my honor as one last joke.

Yeah 'waiting mode'.. Ruins all my productivity

Maybe. Probably varies from person to person, as one would expect. Excessive anxiety is a real problem for some though, with, AFAIU, plenty of actual diagnoses going around for such symptoms.

In my own case, as a recently loosely tentatively self-diagnosed ND, anxiety was one of the obvious problems and give-aways. If there's some possibility of something not being "correct", a pile of obsessiveness and anxiety around that issue immediately ensues, not just around whether it will occur correctly, but also around what I can or have to do to make sure it will be done correctly. Whether it's punctuality or cleaning something or learning something. Sometimes I get anxious about whether I can actually remember anything and actually try to just sit there and remember everything I know, which obviously doesn't work (our brains don't work that way) and causes me anxiety.

The fact that you have put in the effort to calculate down to 30 seconds how long travel time takes is so relatable it's hilarious. One time I calculated to the dollar my entire monthly budget. The alarm there is also on point. Can do the impossible but needs a reminder or it's all out the window.