Related for Avodah Zarah 10:8
התם דלאכילה סגיא בחד יומא הכא דלהקרבה בעינן תלתא יומי ולהקרבה סגי בתלתא יומי והתנן שואלין בהלכות הפסח קודם הפסח שלשים יום רשב"ג אומר שתי שבתות
In those cases where the animals were bought for eating, one day is enough, but here where they were bought for sacrifice, three days are needed. But are three days enough in the case of sacrifices? Have we not learned: The laws relating to Pesah [should be learned] for thirty days before Pesah; R. Shimon b. Gamaliel says two weeks.
Tosefta Megillah
[If] the portion of the Shekalim fell [as part of the normal cycle] next to Adar, either before it or after it, we read it [at its normal time] and then we read it a second time [for purposes of Purim], and so two for the second [portion], and so too for the third, and so too for the fourth. And so too for Chanukah (בחנוכה not בפורים). They ask about the halachot of Passover on Passover, and the halachot of Shevuot on Shevuot, and the halachot of Sukkot on Sukkot. In the study hall they ask about the halachot of Passover thirty days before Passover. Rabban Shimon ben Gamaliel says, two weeks.
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