General size guidance :
6''x3'' (feed 5-6ppl )
or 8''x3''  (feed 10-12ppl)
 
 
 * Please be aware,  the guidance above is only use as a reference since everyone has a different eating portion. It is a standard reference for home portion, volume here is calculated as 2''x2''x4'' rectangular prism. You may serve for more people if you cut in smaller portions.