I was thinking 20 years.
Many people have found that they ripped their CDs to a lower resolution format and now realize their library is useless. I'm not sure if anti pirating software prevents copying the CDA files or not. I think what you want to do is copy the original CDA file to the new disc.
Recognize that file copying is different than streaming in that it uses error checking and will make an exact copy of the file so any computer can be used without any loss of resolution.
Jerry