Musa bin Salamah (may Allah have mercy on him) says: I asked Sayyiduna Ibn Abbas (may Allah be pleased with them both) about wiping over the leather socks, and he said: The traveller (may wipe) for three days and three nights, and the resident for one day and one night. And this chain is sahih (authentic).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1292