The “Redbook” CD specifications state that CDs contain a maximum of 74 or 80 minutes of music. But over the years, record producers have tried to push that limit. There have been some CDs released that approach the 90-minute mark, but I suspect that these are CD-Rs – individual burned CDs – because this is possible using “overburning.”
But I’ve been seeing a lot of CDs recently that are longer than 80 minutes. In the Mozart 225 box set, many of the CDs exceed this duration, and some are even longer than 85 minutes. The longest CD in this set clocks in at 86:30.
This isn’t a problem if you’re playing back the CDs on recent devices, or trying to rip them to a computer, but older CD players may not support these discs because the track that spirals around the disc are too close together for older players to read.