It was narrated that Khuzaimah bin Thabit said:
"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)." (RU)
English reference (RU): Vol. 1, Book 1, Hadith 553 (RU)
Arabic reference (RU): Book 1, Hadith 596 (RU)