Hi, GraceKrispy! Good question. I do not believe that you can sort by file size in the standard firmware. Maybe PRS+ has a feature like that? Here's what I would do. You can sort by file size within Sony Reader Library. I would connect my reader via USB. Then, using the Sony software, 1) create a new collection on your 650, 2) sort the Books category on your 650 by file size and 3) drag & drop however many books you want into your new collection.
Keep in mind that sometimes file size can be misleading. If you have books that have special formatting or embedded fonts or images, then they might actually be shorter reads than the file size indicates. But, it should be close enough to accomplish what you want. Hope that helps!
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