That doesn't surprise me...are you rendering at 300dpi? If not, you should, if you're going to print it and want a decent quality print. If you have reflective and glowing materials, that adds substantially to render time, as I found out when doing one of our contests a few months back. In your world browser, on the right of the screen, where it has the layers and all the objects in your scene, have you grouped similar items as much as possible, or items close together, and then made the layers invisible? I find grouping helps my render time slightly. I"ve also found that while initially a render might say XX hours, as it renders, that time estimate can change, either way.

Sgiathalaich