@PG: Typically, I render at 1280x 960; and, when I did the first render, it crashed after about 24+ hours (see my .jpg post above) - the image was about 2/3 finished.
I recently did two 55% renders - one from the top down; and, one from the bottom up. I plan on joining these in Photoshop as soon as I figure out how to do it. Each 55% render took about six hours.