For FDM technology maximum readily available size is 20x20x18 cm or 24,6x152x155 cm. In case of larger objects we either need to split them into smaller pieces or print them on large scale industrial machine that may take longer. In latter case maximum size of models is calculated in meters.
For SLA technology maximum size is limited by clinder that is18 cm high and 18 cm in diameter.
For SLS technology maximum maximum size is 33x33x59 cm.