That's running 5 miles a day. Everyday. That takes months of training for an already fit young person to build up to.
90 minutes of extra walking is a lot of time to offset a snack that could be eaten in 1 minute.
90 minutes of extra walking is a lot of time to offset a snack that could be eaten in 1 minute.
I also 100% think that your offset point is a big part of it. 90 minutes walking the dog outside is doubly beneficial because you are not snacking during the time.