The Prophet said: "Three days." I think he said, "And three nights during which the traveler may wipe over his leather socks."
Sunan Ibn Majah Book 1, Hadith 288
← Previous Hadith "The Messenger of Allah set a time limit for the traveler of three days, and if the questioner had persisted in asking, he would have made it five (days)."

Sunan Ibn Majah Book 1, Hadith 287 Next Hadith → "They said: 'O Messenger of Allah! What about the purification of the leather socks?' He said: 'For the traveler it is three days and nights, and for the resident it is one day and one night.'"

Sunan Ibn Majah Book 1, Hadith 289