I would start crate training at 3 months old atleast. 9 hours is a long time for any puppy though, maybe you could consider hiring a dog walker to come to your house when your at work and have him or her take Cash out of the crate for a little walk and then put him back. Or you could, even though this is exspensive, enroll your AB in doggy daycare were he will play with other dogs all day when your at work and be tired when you go to pick him. Those are just a couple suggestions of mine. Hope I helped and good luck!