For reference, if ten pieces of Nigiri-zushi had been made from one go of rice, the size of nigiri would have been rather big, and been as big as nigiri recalling the size of nigiri, so-called 'large piece,' in the period from the Edo period to the beginning of Meiji period.
ちなみに1合で10個の握り寿司ならかなり大きな握りで、いわゆる「大握り」と呼ばれる江戸-明治初期を思わせる大きさである。