From what I have seen, most people communities learn all night on just the 1st night of Shavu'ot and not the 2nd night. (Perhaps, there are some that do both nights.)

If in Diaspora, we tend to treat the 2nd day of Yom Tov identically to the 1st, why don't we repeat the same idea on the 2nd night of Shavuot? True, that learning is a minhag (there is no mention of this as a mitzvah in the Torah).

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    Please don't answer along the lines that there isn't enough cheesecake to feed everyone for 2 nights! – DanF Jun 5 at 16:13
  • Kind of touches on it a little (may have to delve deeper in the sources referenced) chabad.org/library/article_cdo/aid/2156/jewish/… – alicht Jun 5 at 16:49
  • At first glance it would seem we pasken that mattan Torah was on the seventh of sivan, not sixth. As such, the reasoning to stay up all night would really only apply to the second night of Shavuos. So really you could ask why we stay up the first night as opposed to the second – robev Jun 5 at 17:15
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    IINM many indeed have the custom to stay up both nights. It certainly doesn’t seem as common, though. – DonielF Jun 5 at 20:03
  • @robev we stay up the first night because that’s the day that Israelis and people of the diaspora share. And we probably do only the first night because it’s too hard to stay up 2 nights in a row, and most people would fall asleep (if not I while learning, then while davening). – Lo ani Jun 6 at 3:43

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