In the book series The Chronicles of Thomas Covenant the Unbeliever, there is a clear time discrepancy between the Land's time and our Earth time.
The Land's moves a much faster pace relative to our Earth time.
Roughly, between the first and second time Covenant is called to the Land,
forty years have passed in the latter (The Illearth War, chapter 3 "The Summoning"), whereas our Earth time was roughly by my calculations from chapters 1 & 2 of the same book 38 days. That makes roughly 1.05 years per day (40 years / 38 days = 1.05), though the day count could be off slightly.
But there are other places of possible time correlation (specifically Book 3, The Power that Preserves) and the question here is whether (1) any book reveals the exact time relationship (whether by statement or more clearly correlated timing to calculate), or (2) any official statement from the author reveals his view of the time relationship?
While Covenant in the first series is unclear whether the Land is merely a dream or not, that is made certain in later books.
So I expect an answer to not rely on the ambiguity of Covenant's viewpoint, but on the fact of what has been revealed about the Land that would indicate some fixed relation exists.