The Rambam writes in Hilchos Talmud Torah:

כָּל אִישׁ מִיִּשְׂרָאֵל חַיָּב בְּתַלְמוּד תּוֹרָה בֵּין עָנִי בֵּין עָשִׁיר בֵּין שָׁלֵם בְּגוּפוֹ בֵּין בַּעַל יִסּוּרִין בֵּין בָּחוּר בֵּין שֶׁהָיָה זָקֵן גָּדוֹל שֶׁתָּשַׁשׁ כֹּחוֹ אֲפִלּוּ הָיָה עָנִי הַמִּתְפַּרְנֵס מִן הַצְּדָקָה וּמְחַזֵּר עַל הַפְּתָחִים וַאֲפִלּוּ בַּעַל אִשָּׁה וּבָנִים חַיָּב לִקְבֹּעַ לוֹ זְמַן לְתַלְמוּד תּוֹרָה בַּיּוֹם וּבַלַּיְלָה שֶׁנֶּאֱמַר (יהושע א ח) "וְהָגִיתָ בּוֹ יוֹמָם וָלַיְלָה":

Every Jewish man is obligated to study Torah, whether he is poor or rich, whether his body is healthy and whole or afflicted by difficulties, whether he is young or an old man whose strength has diminished. Even if he is a poor man who derives his livelihood from charity and begs from door to door, even if he is a husband and [a father of] children, he must establish a fixed time for Torah study during the day and at night, as [Joshua 1:8] commands: "You shall think about it day and night."

There is a mitzvah to learn “by day” and by night”. My question: are there time parameters to this this?

Meaning, does the learning at “night” need to be after certain time, like Skiyah or Tzeis? Similarly, does the mitzvah to learn by day need to be before a certain time?

  • 2
    Megilla 2:6 זה הכלל--דבר שמצותו ביום, כשר כל היום; דבר שמצותו בלילה, כשר כל הלילה.
    – Double AA
    Nov 27, 2022 at 18:45
  • If such a rule applies here, what defines night for example? Since this is d’oraysa, would we have to be machmir and say after tzeis?
    – user
    Nov 27, 2022 at 19:00
  • sefaria.org/Menachot.99b.18?lang=bi See the whole thing, but: 'What is the halakha with regard to studying Greek wisdom? Rabbi Yishmael recited this verse about him: “This Torah scroll shall not depart from your mouth, and you shall contemplate in it day and night.” Go and search for an hour that is neither part of the day nor part of the night, and learn Greek wisdom in it.'
    – MichoelR
    Nov 28, 2022 at 13:49
  • Why should there be time parameters rather than just being a continuous mitzvah during both the day as well as the night?
    – Dude
    Nov 28, 2022 at 19:21


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