It is forbidden to leave the Shul [once] the Sefer Torah is opened [until the completion of the reading, even if there are another ten people in Shul and he already heard the reading]. [In a time of great need, however], one may leave in-between Aliyos.
 Michaber 146:1; See also 149:1; Ketzos Hashulchan 25:11
 M”A 146:2
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