It depends on the scenario, most people work 8 hour shifts and it could have been a situation where something came up and they needed to stay longer than normal. Some dogs need to be kenneled for their safety or just to crate train (I’m not sure how old this dog is but my oldest was crate trained while I was in high school and now roams freely when I’m gone. My current puppy is being crate trained as well and will be for at least a year)
Being kenneled is not abuse but there are definitely other factors that could be involved that we’re not getting details of. I personally work at a dog daycare so my dog’s (primarily the puppy since she actually plays) will go every 2 or 3 days when I’m working and the other days I’m either home and we go outside every 3 to 4 hours or if I work then we go outside a couple of times before I have to leave and they get left with enrichment to occupy them during those 8 hours