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