while we are at it, make short rest a SHORT rest.
1hr is not a short rest.
If you can manage to get hour of downtime from combat in 99% of the cases you can get 8 hrs of down time.
5-15mins is a short rest.
A couple jobs I've had have mandated 1 hour lunches. Never mind that I can walk over to the cafeteria, get and eat lunch, and be back in a half hour. (In places where I bring my lunch, it's closer to 15 minutes.) What do I do with the other half hour? Dunno, not our problem, but by God you better not try to work during that time.
Back when I was doing sports in high school, even after a couple hours of exercise, cool down and stretching and recovery was under a half hour. Needing a full hour of rest just feels wrong, unless you're including hanging out and going home. Which isn't really in the same category as "short rest".
Overall, I can see a half hour being enough, with a little buffer built in. An hour is just way too much. 15 minutes is kinda OK, though it does feel a little short if you're including hit dice usage. Any sort of activity that I can imagine doing feels like 30 minutes is more than adequate to recover from physical exertion.
For a PHB example, a monk recovers his ki on a short rest, requiring 30 minutes of meditation. That seems to imply that 30 minutes is adequate for a short rest.
You always have the option to spend
more time, if you want to do other stuff, but reducing the minimum from 1 hr to 30 minutes should be perfectly reasonable.