Thanks, Steve! What you suggest is something I've done in my head for many years, without being as concrete in my thoughts. i.e., I just say "I better give myself more time for that", add whatever 'feels' right (1/2 an hour, 15 minutes), then go with that.
It was quite a while ago that I realized that in my head, I was thinking some tasks would take
zero time. For example, let's say I was out with friends, and we were going to meet again later at an alternate location. If I had to stop by my house on the way, I wouldn't add the 15 minutes that would realistically take. It's just stopping by my house! Like I thought I would teleport myself in, grab whatever I needed, then teleport back out. Zero time. Nope! I have to physically park my car, unlock my house, look for whatever I needed, get it, go back to the car, etc. Not to mention the half hour (at least!) you should automatically add to any task if you have small children.
I'm not quite so into time management - I'm a go with the flow kinda gal - I changed my ways because at some point I recognized I was
always late to things. It took me a while to realize how rude that is.
For the most part, I've been on time for things for years now. Yay!