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Since we don't find any poskim who bring the words of Rb.Yerucham in Isur V'Heter to wait 3 hours, it seems that presumably there is a printing error, and we should take what is written in Rabbeinu Yerucham (Toldat Adam V'Chava) itself.
https://www.sefaria.org/sheets/52224
I hear that Rav Shmon Schwab advised bnei torah to wait 6 hours, and my father told me that Rav Schwab told him to wait 6 hours. I also know that Rav Schwab was shown the place in Rabeinu Yerucham that said 3 hours, although there is a disagreement between what is written in the main book (Toldot Adam V'Chava) and what is written in the kitsur halachot (Isur V'heter).
https://judaism.stackexchange.com/questions/77114/sources-for-3-hour-time-limit-not-rb-yerucham
The main textual source for the minhag of waiting three hours between eating meat and eating milk is Rabeinu Yerucham. However, it appears to many that the "ג" in there is actually a typo and it should be a "ו" as it does not match what he wrote in his other works, nor does it match his cited source (Rashi) for that waiting time.
https://askhalacha.com/halacha/what-is-considered-the-next-meal/
Rabbeinu Yerucham writes that one only needs to wait three hours. (One possible reason is that Rabbeinu Yerucham lived in Germany where they ate five meals a day, so he interpreted the Gemara to mean three hours, for that was the length of time he had between meals.) The last opinion about waiting between meat and milk is to wait one hour.
https://www.rabbimanning.com/wp-content/uploads/2017/03/Minhagim-Waiting-between-Meat-and-Milk.pdf
Rabbeinu Yerucham refers to a minhag of waiting 3 hours if a person ate actual meat. If not, he appears to agree with the minhag of the other Ba’alei HaTosafot to eat milk immediately after washing hands and cleaning the mouth.
https://www.aishdas.org/avodah/vol23/v23n217.shtml
many associate the source of the minhag Yekke to wait 3 hours (as I keep) to the sefer Rabbeinu Yerucham who writes "gimmel shaos". This, iirc, is the earliest written source where one says 3 instead of either 1 or 6. Many attribute Rabbeinu Yerucham's writing "gimmel" to be a typo and it should have said "vav".
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