usually patterns tell you the final size, but not sure you can make a very large one with layer cakes. the finished size of each square will be 9.5". The largest you could make with one would be a 6X6 setting =9.5x6=57X57. you could add borders, which could add some inches....
you may be able to make it larger if you are using a different setting & yardage -- but that's another story.....