Mine was a 6 hour drive from home, one way. I was thinking about getting a pet store hedgie, because there are no breeders that are less than 4 hours away from where I live. The problem was I was going to be leaving for a week to visit family, and I didn't want to get a hedgie before I left because it would be way too unsettling for the poor guy to be bumped around and possibly have someone else watching him in the first few weeks--and the pet store only had one, so I was concerned that if I waited someone else would buy him while I was gone. So I got to doing some research about the area I was going to be in, hoping that there might be a breeder along the way somewhere, and it turned out that there was actually a breeder 5 minutes away from where my aunt lives. I talked to the breeder and told her I was interested and I picked my little guy up the day I was driving home, that way we could get home and he could get in his cage and be settled in right away without any hassle or delays. But yeah, my hedgie had a 6 hour ride to get home.
I can't imagine a 12 hour drive with a hedgie! I just did an 11 hour one from here to Stratford Canada a couple of months ago. I'd be so worried about the little guy. I hope they slept most of the way and didn't really notice!