Attached Link: http://www.mir.com/DMG/aspect.html

Render to disk, use an image format such as bmp and it'll render to a numbered series of images, if you have to interrupt the render when you come back tick the skip frames already rendered switch and it'll start from the next frame. Then paste the whole lot together using a video edit package.

Most animators render to frames like this anyway. That said why on earth do you want to render an animation this big, outside of a fully digital cinema you won't find anything to play it back! I've added a link which is a great guide to the resolutions needed for common tv/video formats, remember bryce can only render square pixels so you need a video editing package the can convert from square to non-square pixels.

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Toolset: Blender, GIMP, Indigo Render, LuxRender, TopMod, Knotplot, Ivy Gen, Plant Studio.