Reference for Berakhot 102:18
מי שאכל ושכח ולא בירך ב"ש אומרים יחזור למקומו ויברך וב"ה אומרים יברך במקום שנזכר ועד מתי מברך עד כדי שיתעכל המזון שבמעיו
If one ate and forgot to say Grace, Bet Shammai declare he should return to his place and say it ; but Bet Hillel declare he may say it wherever [the omission] is remembered by him. And what length of time may elapse in which he can say Grace? A Sufficient time for the food in the stomach to be digested.
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Rashbam on Pesachim
The issues on which the School of Shammai and the School of Hillel hold differently, concerning the meal: Here it lists just one of their disputes, but in Tractate Berachot (page 51b) there are more.
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