Tweet. Obviously, the answer depends on how fast you walk, but the average person, walking without children can walk a mile in about 20 to 30 minutes. In contrast, you can run a mile in 5 to 9 minutes. If there are inhinderances like steep or uneven terrain, add time to your journey.
Thus, the gestation period for humans in days can be calculated as 280 days. However, the actual gestation period, as compared to other mammals, is around 267 days. But then what is the average gestation period for humans? It is taken to be about 259 to 294 days.
Gestation period, the duration of pregnancy, in humans being about 266 days (38 weeks) from the time of fertilization until birth 3.  266 days is the average gestation period for humans from conception to birth 4. End of Week 38. (266 Days from Conception) - Estimated birth date. 5.