I have 2 dogs. I can't even let them be in the kennel for 4 hours (without issues) let alone 12+ hours.
The reason is very simple. When they are locked in a kennel, their minds become stressed. They can't handle it being locked up in a cage for long periods. They are social creatures and pack animals. Usually at about the 4 hour mark, they start to get hyperactive (which is a sign of dog stress, that's how they get out that frustration).
Almost every single time my dogs are locked up all day (8 hours or so) they have so much energy (hyperactive) when I let them out that they go crazy and even rip apart crap in the yard letting out their frustrations. They ripped apart my above ground pool last year because they tried dragging it across the yard because my GF went out of town in the morning and by the time I got home they were in destructive mode. My pool paid the price.
8 hours in a kennel is fine at night, while its sleeping. But not while they are awake during the day. They need something to occupy their minds.
If you have a dog that's locked up. The moment you get home and let it out, it's going to be a shithead for hours and be so unruly you will want nothing to do with the dog. You will feel like you want to kill it or give it away. That's how I feel when I let them out after being locked up so long. Don't torture yourself or the animal by getting one.
I suggest going to the local animal shelter, where dogs are in cages for hours with no social interaction (except what you see through the gate) and ask an employee if you can take it out to play with it. Just watch how much they will pull, tug, jump around, and go nuts in general. And that is with interaction through the fence, imagine at home where they have nothing... It's only worse. Imagine dealing with it every day. It won't be fun... Do that before you decide to buy a dog. Trust me, you'll change your mind.