Sayyiduna Khuzaymah bin Thabit (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) granted us a concession to wipe over the leather socks (khuffs): "Three days and three nights for travellers, and one day and one night for the resident." And had we asked him for more, he (peace and blessings be upon him) would have given us more.
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3739