Responsa for Berakhot 106:22
א"ל רב יימר בר שלמיא למר זוטרא ואמרי לה רב יימר בר שיזבי למר זוטרא מי אמר ריש לקיש הכי והאמר רב אמי אמר ריש לקיש כמה שיעור עכול כדי להלך ארבע מילין
Rab Jemar b. Shelamya said to Mar Zotra (another version : Rab Jemar b. Shezbi to Mar Zotra) : Did R. Simeon b. Lakish say that? For lo, R. Ammi declared in the name of R. Simeon b. Lakish : What is the length of time for food to be digested ? Sufficient time for a person to walk four Mil !
Shut min haShamayim
We are also unsure regarding 'mayim acharonim', the hand-washing at the end of the meal. There are some sages who hold that since we no longer use fine oils1 to anoint hands during the meal, see Berachot 53b:31, we thus do not need to meticulous about the final hand-washing. I asked [in my dream] regarding this, whether they had anything to rely on in saying so or not.*Some contemporary sources use similar language but cite the lack of dangerous 'Salt of Sodom' [and not the lack of oil] as the reason not to be meticulous about washing hands (Tosafot on Berakhot 53b:32). See also Rosh on Berakhot 8:6 for a similar argument regarding lack of oils.
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