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)." (FR)
English reference (FR): Vol. 1, Book 1, Hadith 553 (FR)
Arabic reference (FR): Book 1, Hadith 596 (FR)