Thank You!
I usually render everything in between 3000 and 4000 px depending on the intended use for the image. In this case I wanted to try to render at a standard resolution for a digital camera to see if the image holds up. The render noise was 4% but I added some (a lot) noise in post. In commercial projects I don't usually add so much, but in these personal projects I'm more loose when it comes to post production.
As for the rendering time, I don't remember exactly how long it took. It did take a long time to render, although it depends on what you mean by long. Since I don't have such a good computer, all my render times tend to be long. I think an image like this could take between 5 to 7 hours.