Shurayh bin Hani said: I asked Sayyidah Aishah (may Allah be pleased with her) about wiping over leather socks, and she said: Ask Ali bin Abi Talib (may Allah be pleased with him). I asked him, and he said: For the resident it is one day, and for the traveller three days.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1317