A slightly optimistic number even for Japanese standards and with little or no scientific evidence to back it up. Most health studies today agree that a more appropriate target for the average healthy person should be around 7'000 steps per day or comparable healthy activity. This equates to approximately 3 miles a day but any target should be based on factors such as age, gender and physique. Take a realistic approach and concentrate on the quality of exercise you are getting.
If you walk or achieve less exercise than this then you are most likely not getting enough of the recommended daily amount to avoid weight gain, bone loss and similar health issues. Additionally, you are most likely sitting and inactive for long periods which in itself puts your health more at risk.
Nobody goes jogging in their slippers yet many of us think little of spending hours on end in shoes that are uncomfortable and painful to walk in just because they fit a certain style or outfit.
Every single step you take is easier and healthier in a kybun shoe. To give this some perspective the average person can walk between one and two million steps per year. A staggering work rate that should not be overlooked, especially when we are choosing footwear.