Sorry I know this has been done to death!
My son was 13 in December.
He is an only child.
He has been left for a maximum of hour and half. I'll leave him to pop to the shop but if I knew I would be more than a couple of hours I would make him come with me. According to him I'm a wuss and can leave him for longer.
My partner agrees with him.
How long are you comfortable enough to leave them for?