Ibn `Abbas said, "We stayed for 19 days with Prophet on a journey during which we used to offer shortened prayers." Ibn `Abbas added, "We offer the Qasr prayer (i.e. shortened prayer) If we stay up to 19 days as travelers, But if we stay longer, we offer complete prayers.
Reference: Sahih al-Bukhari 4299 In-book : Book 64, Hadith 332 USC-MSA web (English) : Vol. 5, Book 59, Hadith 593 (deprecated)
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