They basically said the amount of time would be dependent upon the time of year. Spring/Summer was the longest lead time, while fall was much shorter (and a little cheaper - as they give discounts for doing the work in the fall). I'm guessing six week if it were to happen in the summer, I could be wrong.

I do have a somewhat odd shaped liner - it's a T shape - 18 x 36 of deep water and a shallow, I forget the exact dimensions