Narrated Ibn 'Abbas (RA): The Prophet (ﷺ) (made a journey during which) he had a stop of nineteen days, during which he shortened his prayers. [Al-Bukhari] And in a narration: "(he (ﷺ) stayed) nineteen days in Makkah." In a narration of Abu Dawud: "seventeen days." And in another: "fifteen days." The narration of Abu Dawud from 'Imran bin Husain (RA) has: "eighteen days." His narration from Jabir (RA) has: Allah's Messenger (RA) stayed at Tabuk for twenty days, and he shortened the prayers (during his stay). [Its narrators are reliable, except that there is difference about whether or not it is Mawsul (unbroken chain of narrators)].