I am not comfortable leaving a dog in a crate for 8 hours at a time. I know a lot of people do it, but I don't. And most of the time people say "8 hours", but it always winds up being more like 10 since you have to get to work and come back, etc.
Before we got our first dog as couple, my wife and I figured out how to minimize daytime crating. She skewed her work day in the early direction and I went the opposite way. So I would crate up the dog at around 0830 in the morning and head to work, and she'd be back around 1500. It was a legit 6.5 hours, sometimes 7. However we also arranged for mid-day let-out services. A dog walker would come and get our dog out of the crate for about a half hour for a walk and elimination between 11 and 12.
Certainly crating is an important life skill for a dog as you need it for travelling, training, competing, etc. That said, none of our dogs are crated in the daytime once they are officially housebroken and understand the crate. But Akitas are very chill dogs not prone to running a muck. And most don't prefer crates at home. We're on our third Akita and, just like the other two, after "graduation" from the crate he never used it as a "cave", "den", etc. even though we left it up for him for a few months afterwards. My first Akita did love the crate when competing or showing--for her it was a slice of home while on the road.