I have the great fortune to be home or have someone home. But I disagree with the ones saying 9 hours is too much. If you exercise the dog in the morning and give it a lot of exercise in the evening and weekends, most dogs, even basenjis, sleep up to 17 hrs a day. Make them tired, give them interesting toys/games/ frozen low calorie treats stuffed in kongs... they'll do fine.
Absolutely you need help if you get a puppy. They need to be out at least every 3 to 4 hrs. But, owners have managed longer by having a potty area set up in a large secure playpen or room. Is it ideal? No, but doable. Especially if you can get help most days those first several months... even have a family or friend take the pup during the day.
It depends on how dedicated you are to making things work. While I'd rule out a home away 12 hours a day, I don't think all working people should be discouraged from owning a dog. People have had them and done well for a very long time. Frankly if we rule out homes where all adults work, we're not going to have many homes that can potentially be fantastic.