It can cut about 18" wide by infinite length, in ten inch segments. Only 18 inches wide because you will currently need an indexing mark of some kind for alignment of subsequent cuts. Ultimately we are supposed to get alignment software that does the aligning for us, but that isn’t available yet. (Still in development.)
There are other considerations like having support on both sides of the machine for larger runs, and creating the correct kind of file for using it …those are described in a couple of tutorials. (No video that I know of yet.)
I’d read through both of these to make sure you understand what’s going on, whether it’s your design software or not. Once you understand what’s happening with the Passthrough, you can adapt any design software to use it.