Musa bin Salamah al-Hudhali said: I asked Sayyiduna Ibn Abbas (may Allah be pleased with them both) about wiping over leather socks, and he said: For the traveller it is three days and three nights, and for the resident a day and a night.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1318