You were right. When I let my computer keep working on the file, it eventually converted, after five hours. Unfortunately, the MOBI file Calibre produced wasn't usable. The program stripped off a lot of the formatting so the MOBI file is just a mess.
It looks like I may have a fixed-width EPUB file, not a reflowable one. I wonder if there's a way to convert fixed-width to reflowable, using Calibre.
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