So single people are not allowed to adopt dogs I Imagine from the comments above.
I don't own a dog and won't until I retire, however there is loads of hypocrisy within the dog owning community.
Loads of owners who wouldn't leave a dog for eight hours because it's cruel.
Won't see these activities in the same way.
Giving the dog human food not suitable for it (basically what ever is left on their plate after a meal)
Make the dog have no interaction with other dogs so it becomes a (oh they don't like other dogs) dog
Going out for a half hour walk on the road when their breed requires two 2 hour fast strenuous walks a day 10+ miles.
(Most owners under excersise their dogs)
Humanise the dog out of them. Dogs are happiest when they are being dogs many owners forget this.
Have no discipline/control over their dog, putting it's safety at risk just as much as others.
Oh and the most common form of negligence
Walking on a busy road with your dog off the lead. Yes I know you have the most well trained dog in the world, yes I know it can cook you breakfast and it can clean your house you are both so in tune with each other, but their will be one thing that will make your dog go into chase mode and just because the odds of encountering it are small doesn't mean they are not out there. Walk them on a long lead. No dog has to be more than 10 feet away from you on a road and all leads can accommodate that.
I agree if you've got an old dog that moves slower than a slug on a sleeping pill then you could probably forget the lead.
I wouldn't do it in your situation OP but I am sure there will be some breeds out there that are more suited to your situation.
Retired greyhounds off the top of my head, they are usually kept in a crate for 20+ hours a day alone, so your set up doesn't sound too bad.