For those experienced with language exchange....
How do you organise it?
Frequency once or twice a week?
Length of time? Total one hour? Less than that? More than that?
More than one language partner?
How long beforehand do you arrange to talk?
As you can tell, I haven't been very successful in past due to being a lazy so and so. LOL. No , actually, some of the people that want a language partner already have astonishing ability in their second language.
It depends on how you are busy, how busy is your partner, what kind of language exchange you have.
In any case, a talk longer than one hour can be tiring.