Ibn ‘Abbas said the Prophet (ﷺ) made a journey during which he had a stop of nineteen days, and he prayed two <i>rak'as</i> at each time of prayer. Ibn ‘Abbas said, “So when we are stopping nineteen days between here and Mecca we pray two <i>rak'as</i> each time, but when we stop more than that we pray four.” Bukhari transmitted it.

وَعَنِ ابْنِ عَبَّاسٍ قَالَ: سَافَرَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سَفَرًا فَأَقَامَ تِسْعَةَ عَشَرَ يَوْمًا يُصَلِّي رَكْعَتَيْنِ رَكْعَتَيْنِ قَالَ ابْنُ عَبَّاسٍ: فَنَحْنُ نُصَلِّي فِيمَا بَيْنَنَا وَبَيْنَ مَكَّةَ تِسْعَةَ عَشَرَ رَكْعَتَيْنِ رَكْعَتَيْنِ فَإِذَا أَقَمْنَا أَكْثَرَ مِنْ ذَلِك صلينَا أَرْبعا. رَوَاهُ البُخَارِيّ