When are the rulings of residence applied to a traveler for the purpose of study?

Question:
May Allah reward you with good and do you well. He asks and says: If a person is traveling for study or work abroad and he does not know when he will return, what is the duration for which he shortens the prayer? And if he knows that he will stay for more than four days, is it permissible for him to shorten the prayer or should he pray with the people? May Allah reward you with good.

Answer:
The position held by the majority of scholars is that if he knows he will stay for more than four days, he must complete the prayer, because the rulings of travel are severed for him and the rulings of residence become obligatory upon him, including the completion of the prayer. It is even more obligatory for one who goes to study and resides for years in the country of study; he must complete the prayer because he has become a resident. Likewise, he must fast Ramadan because he has become a resident. Yes.