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Same questions: what version of InDesign are you using, and on what platform and OS? (For all the similarities, there are differences in the details).
And are you exporting to FXL or reflowable?
And exactly what error/s are you seeing, either in reported ones or failed outcomes?
There aren't any hard limits I know of (size, pages, elements, etc.) but things like internal indexes and build tables can get exceeded with no good indicator of what's wrong.
Some things to try are to only process half the book at a time. Working from a copy, delete about a third of it and try again. If that works, delete the first third or so and try. See if you can narrow it down to a particular size or particular part of the book that's actually causing the problem. It is often a faulty component (bad image file, corrupted table, etc.) that causes these kinds of problems, rather than any one fixed/known fault of the format or export itself.
Another possibility is that you have too large a document to be squeezed into one content file within the EPUB. (The way to check this would be to look into the EPUB and see how many and what size XHTML content files are being generated, but if you aren't getting that far, it will have to be more indirect.) Try this: in the export dialog, General pane, select Split Document and check the Single Paragraph Style box, then set the style to something like your chapter heading, so that the export will create that many subcomponent files instead of one.
For the most part, this is invisible to the end result (although there are reasons both to use and not use multiple content files). It may get around whatever size blockage you're encountering.
If you have a lot of images, try setting the export to JPEG and 150 ppi, to reduce the number of file types and their size.
And... report back!
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