Hammam bin al-Harith narrates from Sayyiduna Jarir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Three days for the traveller and one day for the resident, with regard to wiping over leather socks."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2418