Favorite lists can be populated with tracks automatically
. Either when listening to music and/or immediately based on one or several keywords (tags). Read more
What's "Display totals" ?
When enabled (checked), this personal setting displays the total duration for albums, performers, years, favorite lists etc.
Please note that enabling this setting adds some overhead to the time taken to generate the page, since the duration for each track is stored as seconds in the database, but displayed as mm:ss.
If you enable this setting, you might also consider enabling "Display duration on tracks" (see this FAQ-entry).