Narrated Ubai bin ‘Imara (rad):

I asked, “O Messenger of Allah, may I wipe over the Khuffain (leather socks)?” The Prophet (ﷺ) replied, “Yes”. I asked, “For one day?” He replied, “For one day”, I again asked, “And for two days?” He replied “For two day s too”. I again asked “And for three days” He replied, “Yes, as long as you wish”. [Reported by Abu Da’ud, who said, “It is not strong”]

وَعَنْ أُبَيِّ بْنِ عِمَارَةَ ‏- رضى الله عنه ‏- أَنَّهُ قَالَ: { يَا رَسُولَ اَللَّهِ أَمْسَحُ عَلَى اَلْخُفَّيْنِ? قَالَ: "نَعَمْ" قَالَ: يَوْمًا? قَالَ: "نَعَمْ", قَالَ: وَيَوْمَيْنِ? قَالَ: "نَعَمْ", قَالَ: وَثَلَاثَةً? قَالَ: "نَعَمْ, وَمَا شِئْتَ" أَخْرَجَهُ أَبُو دَاوُدَ, وَقَالَ: لَيْسَ بِالْقَوِيِّ } [1]‏ .‏