What is the only Watan type that can legally invalidate a person's original permanent homeland (Watan al-Asli)?

The Traveler's Prayer (صلاة المسافر): Distance and Duration

• Any stay of 15 days in another city.
• Only by establishing another permanent, original homeland (Watan al-Asli).
• By establishing a temporary Watan al-Iqamah.
• By traveling on a ship.