There is a practical limit. "Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit of 15 million by 15 million inches, or

There is a practical limit. "Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit of 15 million by 15 million inches, or 225 trillion in2 (145,161 km2)." <https://en.wikipedia.org/wiki/PDF https://en.wikipedia.org/wiki/PDF>