Trivia time:
The original specification from Philips regarding the CD format was that it had to have a capacity of at least 74 minutes long, as to be capable of playing Beethoven's 9th symphony on one disc.
Today's CDs can deliver 80 mins, but even that can be exceeded by so called overburning (not really within specification but it will work on most players).
The longest commercial CD available, if I'm not mistaken, is "a classical piece by Douglas Yeo which is timed at 80 minutes and 17 seconds"
The amount of "music time" on the CD is limited only by the actual capacity of the files contained on it.
Which is why an "original" CD mastered in .cda format (linear PCM) by the correct specifications will be generally limited to 80 mins and when using .mp3 may many more hours as each minute of music takes up less space on the CD.
DTS audio discs use ordinary Compact Discs as carriers but the music is encoded in a different way to a normal CD, yet still conforming to the red book standard, so depending on the encode bitrate, the playing time is different.
Data is data, so there is no actual size difference between a CD track of 220Mb and a Word or Excel document of 220Mb.
I remember reading that some research group in Ireland many years ago coming up with a different way of storing the info on a CD that could enable more efficient data packing, but it wasn't commercially viable.