Beautiful Hadith is about Prayers During Travels

Narrated Ibn `Abbas RA: The Prophet (peace be upon him) once stayed for nineteen days and prayed shortened prayers. So when we travelled (and stayed) for nineteen days, we used to shorten the prayer but if we travelled (and stayed) for a longer period we used to offer the full prayer. (Bukhari - Vol. 2, Book 20, Hadith 186)