Not an Elegoo Saturn, but an Anycubic printer is my device. I've noted that each layer is loaded from the flash drive moments prior to the burn/flash/print. I suspect this method is used in many printers.
If you consider that even a large LCD panel requires only to present an open path for UV light or a closed path for each pixel, the amount of data required for a full printed layer or a fully empty layer is quite small in terms of bytes.
Non-monochrome LCD panels would use more data, as each pixel is defined in three colors (or none) compared to monochrome (on/off).
I believe that my printer uses the Chitubox board system, making the similarities to yours a valid comparison.
Your limitations would be based on the size of the medium containing the file as well as the physical size of the print.