Ruling on shortening the prayer for a traveler who stays for a month

Question:
Is it permissible for a traveler who stays for a month or more to pray the shortened prayer?

Answer:
If a traveler is in the course of his journey and has not settled down, he prays the shortened prayer as long as he is a traveler. However, if he stops and stays for more than four days and intends to remain, the majority of scholars hold that he must complete the prayer. Some scholars hold that he may shorten the prayer absolutely as long as he intends to travel until he returns to his family. But the most cautious course is to complete the prayer if the stay he has resolved upon is more than four days; completing it is more cautious for him. This is because the Prophet (peace and blessings be upon him) only shortened the prayer while intending to stay, on the day of the Farewell Pilgrimage, when he arrived on the fourth of Dhu al-Hijjah and shortened the prayer until he went out to Mina on the eighth. He had resolved to stay for that period. So if he resolves to stay for more than four days, he completes the prayer; this is the most cautious course. If the stay is four days or less in the course of the journey, he shortens the prayer, and there is no blame on him. Some scholars hold that he may shorten the prayer absolutely until he returns to his homeland, but the most cautious course for him is that if the stay is more than four days—meaning he resolves to stay for four days or more, or for a month, or fifteen days, or the like, with a firm resolution—the most cautious course for him is to complete the prayer.