@
mkeINjp - here's a recent unsolicited post from a user regarding the number of books calibre supports ==>>
https://www.mobileread.com/forums/sho...65&postcount=9
In a library of ~80,000 books I have individual files up to 1.5GB (they're video's). The size of the files only makes a difference when you do something with a file - e.g. it will take longer to transfer a 400MB book to an e-reader that a 4KB book.
Regarding large PDF's, if you only want to organise, find, read and transfer them (to a e-reader) etc then the only limitation is disk space and bandwidth. The fun and games start if you want to convert them, see this ==>>
Read this before Posting PDF Conversion Questions
BR