My Sadie is left alone most of the day (9 hours) and has been for most of her life. I have to work and I've explained it to her many times. Even left alone is better than the life she had caged at a shelter.

The dog you are looking at is older so will be less active and won't mind a nice long nap while you are at work. There will likely be an adjustment period while the dog gets use to your schedule which could mean accidents and chewing but you can leave out paper and hide stuff you don't want chewed. Buy a nice doggie bed and all types of toys til you know his favorite and I think you'll have one very happy dog.