Knowing Song Length

[Kamakazik]

How do you know when your songs' effects wear off?

Is there a message like "_____'s Ballad II effect wears off." or how do ya know?
Would you just keep on just running back and forth, keeping the songs alive?

[Rekiem]

Theres a message that appear in the log when someone is affected by your song and when the song effect is over.