For how long may a traveler shorten his Prayer if he stays in a town? Sunan Ibn Majah 1073

Arabic hadith text
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا حَاتِمُ بْنُ إِسْمَاعِيلَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ حُمَيْدٍ الزُّهْرِيِّ، قَالَ سَأَلْتُ السَّائِبَ بْنَ يَزِيدَ مَاذَا سَمِعْتَ فِي، سُكْنَى مَكَّةَ قَالَ سَمِعْتُ الْعَلاَءَ بْنَ الْحَضْرَمِيِّ، يَقُولُ قَالَ النَّبِيُّ ـ صلى الله عليه وسلم ـ ‏"‏ ثَلاَثًا لِلْمُهَاجِرِ بَعْدَ الصَّدَرِ ‏"
Translation
It wasnarrated that ‘Abdur-Rahman bin Humaid Az-Zuhri said

“I askedSa’ib bin Yazid: ‘What have you heard about staying in Makkah?’Hesaid: ‘I heard ‘Ala’ bin Hadrami say: “The Prophet (ﷺ)said: ‘Three(days) for the Muhajir after departing (from Mina).’”** The meaning of it is: being hished from the rites (of Hajj).