[chaley]

OK, what that says is that it took 6 second to synchronize metadata. Later it took 6 seconds to send the book, then 6 seconds again to sync metadata. The entire process (connect and send) finished in 32 seconds. That seems reasonable to me.

Where is the 'long time' you mentioned? Is it after disconnecting the device (the little arrows are spinning)? It doesn't appear to be while calibre is running.

Edit: the log also shows that calibre thinks all the books have not changed. The 'need_sync=False' in the first two seconds says that all the files agree with calibre's stored information about the file. In this case, calibre does not look further at the books' metadata.

Edit 2: there have been reports that using the PDF metadata writer (which you are) creates files that bother the Sony. It could be that the Sony scan process is choking on the books and changing its metadata DB. You could try disabling the PDF metadata writer plugin (preferences -> advanced -> plugins -> writers)