Tweetnight time or a few hrs during the day?..for an afternoon type thing, like after school while we're at work, it was at 11yrs old for my daughter and 12 for my oldest son (now 18). at both homes, here and in fla, we had retired people living next door and my daughter did that babysitting class thing. in fla, my son only had to stay by himself for about an hr, then his mom would get home. we had retiree's next door as well. imo, it has to do with the majurity level of the kid in question. i was left at home starting at 11yrs old. my mom came home first, but not untill 6-7pm and i got home from school at 3. never had a prob. and we never have had a prob. with our kids either