Most dogs, puppies included, won't potty where they sleep and eat, so you are less likely to have accidents if confining to a crate than to a large room like the kitchen. Especially if you crate at night and feed meals in the crate right off the bat. That being said, an 8 week old puppy can only 'hold it' for so long (general rule of thumb is months of age + an hour between needing to eliminate), so 6 to 8 hours alone is pushing your luck, at least while still a baby. You may want to consider trying to find someone you trust to come let the puppy out while you are away on the days that she will be alone for more than 3 or 4 hours at a time.
Congrats on the new puppy, enjoy and be patient, even the best GSD puppies can be quite a handful, lol!
Omen v Wolfstraum
Jasmine Katie v Doolanshaus