When have you been there for the last time...
When have you been there for the last time?
&
Whеn wеrе you thеrе last?

What is the difference?

Question

​ When have you been there for the last time...
When have you been there for the last time?
&
Whеn wеrе you thеrе last?

What is the difference?

Answer

Because you are talking about a specific time in the past the 1st sentence is not grammatically correct. Only the second question is correct although I think I would reorder the words. - 'When were you last there?' This sounds more natural.

Best wishes.

Bob