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From when may one recite Shema in the evening? From the time when the Kohanim go in to eat their Terumah [produce consecrated for priestly consumption], until the end of the first watch – so says Rabbi Eliezer. And the Sages say: Until midnight. Rabban Gamliel says: Until the break of dawn. It once happened that his [Rabban Gamliel’s] sons came from a house of feasting. They said to him: We have not recited Shema. He said to them: If dawn has not broken, you are obligated to recite it. And [this is true] not only in this case; rather, in all cases where the Sages said that [some precept can be performed only] until midnight — their precepts are [still in force] until the break of dawn. [For example:] Burning the fats and limbs [of the sacrifices, on the Temple altar] — their precepts [can be performed] until the break of dawn. And [another example:] all [sacrifices] which may be eaten for one day — their precepts [of eating them can be performed] until the break of dawn. If that is so, why did the Sages say, "until midnight"? To distance a person from transgression.

The school of Shammai says: In the evening all people should recline and recite [Shema], and in the morning they should stand, since it says [in the verse (Deut. 6:7)], “And when you lie down and when you arise.” But the school of Hillel says: Each person may recite it in his usual way (posture), since it says (ibid.), “And when you walk on the road.” If so, why does it say “and when you lie down and when you arise”? —[It means:] at the time when people are lying down, and at the time when people are arising. Said Rabbi Tarfon: “I was once traveling on the road, and I reclined to recite [Shema] in accordance with the view of the school of Shammai, and [by doing so] I put myself in danger of [attack by] bandits.” They [the other Sages] said to him: “You would have deserved to be guilty for your own fate, since you went against the view of the school of Hillel.”

Shacharit [can be said] until midday. Rabbi Yehudah says until four hours into the day. Minchah [can be said] until the evening. Rabbi Yehudah says until the middle of the afternoon. Ma'ariv has no set time and Musaf can be said all day. Rabbi Yehudah says until seven hours into the day.