It is narrated from Sayyiduna Khuzaymah bin Thabit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said concerning wiping over leather socks: "For the traveller it is three days, and for the resident one day."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1312