Thanks for the reply! I checked the total path length and came out 236 characters. So there really isn't a need to truncate yet, even though it comes close to the limit of Windows/ntfs 255 characters. I can understand a truncating mechanism may be present.
So I did a search here and found an old thread that states Calibre truncates at 36 characters (edit: per section, not the entire path naturally):
http://www.mobileread.mobi/forums/sh...d.php?t=220936
Is this still so in the current version? And if so, is this also true for Linux Calibre, since Linux has no such issues with their filesystems? I can always switch to Linux.