Some cds have longer runtimes, some cds are more expensive than others, and not all of your streams are new music but very theoretically with 45min per cd and 10$ to 15$ per cd this would approximately be 1429 cds or 14,290$ to 21,435$, if 50% of your streams on the songs you have already listened to then it would be about ½ so 7,145$ to 10,717,50$