My youngest is 10 and has been out since 8 this morning and now is hot and tired and just wants to slump on the sofa and watch tv. I need to go and do some shopping and everyone else is out and won't be back for a few hours. I sometimes do nip out and leave him on his own for an hour or so if he doesn't want to come with me (though usually his older brother is around), but I can't do it without feeling hugely guilty and anxious and rushing to get back. What age do other people think it's OK to leave kids in the house on their own and for how long?