Kids should never be left alone until they are 8 years old, and kids between the ages 8-10 shouldn't be left for more than an hour-and-a-half or during night-time hours. Kids ages 11-13 may be left alone up to three hours but not --late at night.-- Per her research, only kids 16 and up may be left unsupervised overnight.Jul 15, 2016read more >>