I have 4 demanding dogs so I am most definitely an avid walker. I walk twice a day, 7 days a week, 365 days a year come snow, rain or shine. Occasionally it is only the one walk per day (if I do one long walk or someone else takes the dogs out for me) but 90% of the time it is twice per day. Walks can be of variating length. A long walk might be 1 1/2 hours, a short one 30 minutes. Typically it is two 45-60 minute walks, adding up to 1 1/2 - 2 hours per day. I have no idea how many miles I walk. If I had to guess I would say at least 2-3 miles per walk as I walk pretty darn fast.
When you get into the habit of walking daily it becomes addictive. I feel awful if I don't get my walks in. Besides, if I didn't, the dogs would drive me up the wall so I have no choice.