How old were you the first time you were left alone? How old will your children be?
I was a latchkey kid from way back... I probably was 9 coming home with my little brother for an hour or so until my older brother got home.
I work at home, so it will be a long time before my kids are alone, it depends on how my kids are. Right now it seems like my son will be 20 before he can be left alone, but we will see.