I'm afraid that one of the things you have to put up with in Bryce. Big files mean big render times, especially if you have loads/thousands of objects. During our recent spate of render madness aka - The Crystal Palace, we were looking at saving-times of 12hours or more, with render times of around the same. My machine is getting on to around twice the power of yours but I also had something like 15,000 objects and 12.5millions polys to deal with. If you hit save, leave your machine alone until the drop-down toolbar disappears. Doing anything else could endanger your work. I usually save or render overnight. It's safer that way.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...