If you are loading songs for the first time you will spend 8 to 15 minutes per disk in the load process. The better quality disks take less time. If you do not want your books filled with typo's and miss spelling make the changes when you load the songs. The database is fairly good but it does contain mistakes so you should check the Songs it says are on the disk against what the disk says.
See this post:
http://forum.mtu.com/showthread.php?t=6103
Good Luck.