['This mishna determines the times beyond which the different prayers may not be recited. According to the Rabbis, the morning prayer may be recited until noon. Rabbi Yehuda says: It may be recited only until four hours after sunrise. According to the Rabbis, the afternoon prayer may be recited until the evening. Rabbi Yehuda says: It may be recited only until the midpoint of the afternoon [pelag haminḥa], i.e., the midpoint of the period that begins with the sacrifice of the daily afternoon offering and ends at nightfall, which is the end of the afternoon. The evening prayer may be recited throughout the night and is not fixed to a specific hour. According to the Rabbis, the additional prayer may be recited all day. Rabbi Yehuda says: It may be recited only until seven hours after sunrise.', 'In addition to the halakhot relating to the fixed prayers, the Gemara relates: Rabbi Neḥunya ben Hakana would recite a brief prayer upon his entrance into the study hall and upon his exit. They said to him: The study hall is not a dangerous place that would warrant a prayer when entering and exiting, so what room is there for this prayer? He said to them: Upon my entrance, I pray that no mishap will transpire caused by me in the study hall. And upon my exit, I give thanks for my portion.', 'The mishna cites a dispute with regard to the obligation to recite the Amida prayer, also known as Shemoneh Esreh, the prayer of eighteen blessings, or simply as tefilla, prayer. Rabban Gamliel says: Each and every day a person recites the prayer of eighteen blessings. Rabbi Yehoshua says: A short prayer is sufficient, and one only recites an abridged version of the prayer of eighteen blessings. Rabbi Akiva says an intermediate opinion: If he is fluent in his prayer, he recites the prayer of eighteen blessings, and if not, he need only recite an abridged version of the prayer of eighteen blessings.', 'Rabbi Eliezer says: One whose prayer is fixed, his prayer is not supplication and is flawed. The Gemara will clarify the halakhic implications of this flaw. Rabbi Yehoshua says: One who cannot recite a complete prayer because he is walking in a place of danger, recites a brief prayer and says: Redeem, Lord, Your people, the remnant of Israel, at every transition [parashat ha’ibur], the meaning of which will be discussed in the Gemara. May their needs be before You. Blessed are You, Lord, Who listens to prayer.', 'While praying, one must face toward the direction of the Holy Temple. One who was riding on a donkey should dismount and pray calmly. If he is unable to dismount, he should turn his face toward the direction of the Temple. If he is unable to turn his face, it is sufficient that he focus his heart opposite the Holy of Holies. ', 'Similarly, one who was traveling in a ship or on a wagon or on a raft [asda] and is unable to turn and face in the direction of Jerusalem, should focus his heart opposite the Holy of Holies.', 'Rabbi Elazar ben Azarya says: The additional prayer is only recited in a city where there is a quorum of ten [ḥever ir]. The Rabbis say: One may recite the additional prayer with a ḥever ir or without a ḥever ir. Rabbi Yehuda says another opinion in his name, the name of Rabbi Elazar ben Azarya: Any place where there is a ḥever ir, an individual is completely exempt from reciting the additional prayer.']