Each serving team handles 18-20 people at each dinner seating....on rare occasions it may be as many as 24, and if the ship is unfull for some reason, someone may have as few as 16...but these are not the usual. Also, a server may have been assigned a full load but a table of guests asked to be moved to another rotation or dinner time, leaving one serving team a little light.....
Room stewards handle about 10-12 cabins.