AD7658-1 tconv > 3.1us

We have a mature design that uses the AD7658-1 and have noticed that the conversion (tconv) time is exceeding 3.1us at -40°C.  Datasheet figure 17 indicates that tconv will increase as temperature drops, but it does not show it going above 3.1us.  Page 6 gives a maximum tconv of 3.1us.

Does anybody know what is wrong?

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