When the Playlist is highlighted, at the bottom of the window, in the center, you will see a display of how many songs are in the list, the playing time, and the Megabytes. The playing time may be in decimal format, you can change it to H:M:S by clicking it. If this time is more than 80 Minutes (1 hour, 20 minutes), the length of a standard Audio CD, all the music will not fit on that disc.