Burning CDs?? Help?!?!?

So, I have a memorwex cool colors cd and its supposed to hold 80 mins and like im trying to burn like 25 songs that last like 4ish mins each, and on the format thing i selected audio cd and 2 seconds in between but it says it cant hol that much but its not 80 mins am i doing something wrong?? what do i dooo???