Sayyiduna Khuzaymah bin Thabit (may Allah be pleased with him) said: We asked the Messenger of Allah (peace and blessings be upon him) about wiping over the leather socks (khuffs), and he (peace and blessings be upon him) said: "For the traveller three days and three nights, and for the resident one day and one night." And had the questioner persisted in his question, he (peace and blessings be upon him) would have given him more.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3735