So, over the course of my career, which is definitely still very young, I have tried (without stacking images) to capture a great long exposure. With digital programs achieving a seemingly 4 h
our exposure is easy, if you're willing/able to capture hundreds of exposures, and then stack them upon themselves after the fact. It's not that I find this process too difficult, I just don't prefer it. Although with digital you're strapped by your camera battery's charge.
I have probably done long exposures two dozen times since I truly learned how to. Of those two dozen times, I've probably walked away with less than 10 viable images. Not that the images I have captured aren't a personal achievement to me, they just aren't anything I would expect a stranger to pay money to buy from me. It's just part of the learning process for me.
If I was better with my film cameras, I could take a 24 hour straight exposure if I felt so inclined...but that's a whole other beast to conquer!
Here's a few examples of what I've come up with so far. One is from early this year, and the other from about 6 nights ago. The second image is problematic in the aspect that I took it in a highly populated area (as there are power lines), and the light pollution, although low all things considered, still alters the images integrity.