Not OP, but it could be a sweat issue. For me a half mile is plenty far, especially in direct sunlight and/or if I’m wearing a backpack, to work up a sweat walk

Not OP, but it could be a sweat issue. For me a half mile is plenty far, especially in direct sunlight and/or if I’m wearing a backpack, to work up a sweat walking at just a leisurely pace. If I had to hurry, I’d be visibly sweaty by the time I got to my office.