What is the criterion for considering a person a resident or a traveler?

The questioner : O Shaykh, O Shaykh, what is the ruling on the prayer of a traveler if he stays in a town for more than three or four months...

The Shaykh : If you intend to reside, put this aside for now, if you intend to reside, no matter how short the duration is, you are a resident. And if you do not intend to reside and remain hesitant between residing and traveling, you are a traveler, no matter how long the duration of your stay is.