Question:
Is it true that the prohibition against leaving Eretz Yisrael only applies when one leaves for more than 30 days, and that a trip of less than 30 days is automatically permitted?
Answer:
The commonly repeated claim that one may freely leave Eretz Yisrael for up to 30 days does not appear to have a clear source in the classical halachic literature. Neither the Talmud, Rambam, nor Shulchan Aruch explicitly establish a blanket distinction between trips lasting less than 30 days and those lasting longer.
On the contrary, the primary sources discussing leaving Eretz Yisrael imply that even temporary departures require justification. The classical heterim generally focus on the purpose of the trip—such as marriage, Torah study, livelihood, or similar needs—rather than on its duration. The fact that a person intends to return shortly does not, by itself, appear in the early sources as a stand-alone permit.
Nevertheless, a number of contemporary authorities have suggested that temporary travel may be treated more leniently than permanent relocation. Some have argued that where a person needs rest, recreation, medical relief, emotional renewal, or a change of environment that cannot reasonably be obtained in Israel, there may be room to permit a short trip abroad. These discussions generally focus on the temporary nature and necessity of the travel rather than on a specific number of days.
While some modern rabbis mention a period of 30 days as a useful guideline or indicator of temporary residence, this does not appear to be a universally accepted rule, nor is it rooted in an explicit source establishing that all trips under 30 days are automatically permitted. Other authorities discuss temporary travel without mentioning any specific duration at all.
Accordingly, it is difficult to maintain that there is a definitive halachic rule that departures of less than 30 days are permitted while longer departures are forbidden. The more accurate formulation is that the classical sources evaluate the purpose of leaving Eretz Yisrael, and contemporary discussions about short-term travel are based on broader considerations regarding temporary absence and legitimate need rather than on a universally accepted 30-day exemption.
Sources:
Michaber O.C. 511:6; Y.D. 372:1; Even HaEzer 75; Rambam Melachim 5:9; Babylonian Talmud, Kesubos 11a; Avoda Zara 13a; Kiddushin 31b; M”B 511:14; Birkeiy Yosef 568; Peri Haretz E.H. 3:11; Shaareiy Teshuvah 568:20; Pitchei Teshuvah, Even HaEzer 75; Sdei Chemed Eretz Yisrael 37; Rabbi Moshe Feinstein, Igrot Moshe, Even HaEzer I:102; Nitei Gavriel 90:4; Likkutei Sichos 15:202 footnote 15; 18:399; 25:151; Shulchan Menachem 7:147-148; Sichos Kodesh 5716 34, 2nd day of Chag Shavuos p. 276; Sichas night of Gimel Tamuz p. 290; Igros Kodesh 18:404; Gilyon Kefar Chabad 93 p. 12; 86; Rabbi Eliezer Waldenberg, Tzitz Eliezer; Rabbi Ovadia Yosef, Yechaveh Da’at and Yabia Omer discussions concerning leaving Eretz Yisrael