How many miles can a rear diff go before replacement?

How long is a piece of string?
There are to many variables to say for definite but if the VCU is in good condition and the diff oil is changed then it should last longer than the rest of the car!!
 
Excellent :) do you happen to know the diff oil type for this one. My MacBook broke on me :/ lost all my files except my school files they were on the cloud :)
 

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