The Prophet ﷺ said: The time limit for wiping over the socks for a traveller is three days (and three nights) and for a resident it is one day and one night. Abu Dawud said: Another version adds: Had we requested him to extend (the period of wiping), he would have extended.  

عَنِ النَّبِيِّ ﷺ قَالَ الْمَسْحُ عَلَى الْخُفَّيْنِ لِلْمُسَافِرِ ثَلاَثَةُ أَيَّامٍ وَلِلْمُقِيمِ يَوْمٌ وَلَيْلَةٌ  

I asked: Messenger of Allah ﷺ may I wipe over the socks? He replied: Yes. He asked: For one day? He replied: For one day. He again asked: And for two days? He replied: For two days too. He again asked: And for three days? He replied: Yes, as long as you wish. Abu Dawud said: Another version says: He asked him about the period until he reached the period of seven days. The Messenger of Allah ﷺ replied: Yes, as long as you wish (i.e. there is no time limit). Abu Dawud said: There is a variance in the chain of narrators of this tradition. The chain is not strong. Another chain from Yahya b. Ayyub is also disputed.  

يَحْيَى بْنُ أَيُّوبَ وَكَانَ قَدْ صَلَّى مَعَ رَسُولِ اللَّهِ ﷺ لِلْقِبْلَتَيْنِ أَنَّهُ قَالَ يَا رَسُولَ اللَّهِ أَمْسَحُ عَلَى الْخُفَّيْنِ قَالَ نَعَمْ قَالَ يَوْمًا قَالَ يَوْمًا قَالَ وَيَوْمَيْنِ قَالَ وَيَوْمَيْنِ قَالَ وَثَلاَثَةً قَالَ نَعَمْ وَمَا شِئْتَ