Question

Being debt free within the next 15 years is an example of which goal

Answer 1

Long term goal because it's years not something like days or weeks.

Answer 2

I agree with the person above - being debt free within the next 15 years in an example of a long-term goal.
A short-term goal would involve hours, days, or even months. But here, we're talking about years, at least 15 of them, which is a long time during which many things can change. So it is definitely a long-term goal, given that it won't expire any time soon.