Here is a quote from Real Age.com.
In a 12-week study of significantly overweight women, those who walked for 30 minutes 5 days per week lost weight at a rate similar to that of women who walked for 60 minutes 5 days per week. Researchers speculate that greater health benefits from longer walks probably start to kick in after 12 weeks. Your weight and fitness level will likely determine how your body responds to exercise programs of varying degrees of intensity and duration.
I leave you with a couple of pictures of one of our sight-seeing walks through Asturias, Spain.
* Scroll on down to see the rest of our Journey through Asturias part I.