I am "directionally challenged," so I rely on Waze navigation in the car when I'm driving and Google Maps walking directions any time I'm walking somewhere unfamiliar. Recently, my 14-year-old son wanted to walk home from summer camp, and I checked to see that it was a 40-minute walk. Well, that's what Google Maps says. But how accurate are the time estimates? Perhaps this is something Google would consider adding in the future, but for now, it provides numbers based on average pacing that will be accurate for the largest number of people.