Quote:
Originally Posted by cybmole
...but if you do have individual epubs sized at 200+Mb, then I wish you luck converting those to kindle format - you will need it!..
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In case it is of help to those who convert from epub to azw3, for example, the above claim, as the generalisation it is, is incorrect, and I did a test as an example.
The largest epub in my library is 295.3 MB; on a not very great 64 bit PC (old Intel CoreDuo CPU) Calibre converted it to azw3 in under 20 seconds. The copy was slightly greater in size at 299.7 MB. Of course the integrity of the copy cannot {EDIT: should be "couldn't} be tested on a Kindle, but appeared perfect in Kindle for PC.
The reason is probably pretty obvious to most in that most of the volume of a large epub, for example, is as has been said by others, images. The images are of little overhead for the conversion, they being files that are simply transferred to the new book.
But, as Katsunami says, a large book comprising mostly of text and formatting may pose a problem.
{EDIT:
for clarity; meaning I don't have a Kindle to test it on. The 295MB epub runs fine on my PRS-T1, I have no doubt that it is possible that the azw3 would work on a Kindle}