I can be gone for 30 minutes or all day (work). He goes crazy barking, whirling around, preventing me from walking into the house. If anyone saw him, they would think he is being aggressive, but he isn't. He has never bitten anyone, and I am "his person". The problem is my other dog thinks he is being aggressive, and is confused, and he barks at me now also. Oh, and if I try ignoring him, it goes on and on - longer than 5 minutes.
He only does this with me. My roommate can come in, and he doesn't bark at him at all. Interestingly, I can remember when this started. I had him about 3 months (he is a 4 year old rescue), and one day he decided I was "his". He began following me around everywhere, and this behavior started also.
BTW, I read the post "My dog gets aggressive to me when I come home", and the actions are not similar in that he doesn't ever bite. He is a very sweet natured dog, and except for this annoying behavior, he is a good dog.