Finished future actions

By the time I graduate, I plan to have been studying Spanish for 2 years.
Is it correct? Yes. The tense also implies that you will continue to study it after you graduate..



My goal is to have paid off all my debt in five years.
Does "in five years" mean before in less than five years? No

Okay,
Is it fine to say "By the time I graduate, I plan to have studied Spanish for 2 years"?

Yes

But my studying is not going to continue after my graduation?
Am I right?

When I say "By the time I graduated, I intend to have been studying Spanish."
Without saying "for 2 or 3 or years or whatever" does the sentence imply that I'll continue studying Spanish after I graduate?

But my studying is not going to continue after my graduation? We don't know. Maybe, maybe not.

When I say "By the time I graduate graduated, I intend to have been studying Spanish."
Without saying "for 2 or 3 or years or whatever" does the sentence imply that I'll continue studying Spanish after I graduate?

That's such an odd thing to say that I'd have to ask you for an explanation of your meaning.

By the time I graduate, I intend to have been studying Spanish.
Does it have the same meaning as "By the time I graduate, I intend to have been studying Spanish for 2 years."?

No. One mentions 2 years. The other doesn't.

By the time I graduate, I intend to have been studying Spanish for 2 years.
This sentence implies that I'll continue studying it after my graduation.
Okay,
What about this sentence?
By the time I graduate, I intend to have been studying Spanish.