As a rule of thumb, every 11 minute 25 seconds of stereo at 16FS and 32 bits takes up about 4GB of space (which is the maximum size for 32 bit wav files) so on an average typical CDs that are 40 - 45 minutes long will take about 16GB of space at 16FS 32 bits. At 8FS 32 bits that is 8GB and at 8FS 24 bits it will be 6GB.