24×24″ is just an indicative size if the collage is square, and printed at 150DPI. You can print larger, but this is around the size where quality will be optimal.
You can also print at other sizes – by using the Collage Maker’s ‘Snap drop-down’ and setting it to the size you’d like to print at (e.g. 20×24) you can ensure your collage will fit the desired poster size perfectly.
