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The latency for the full round trip would be 4.705ms, meaning 2.3525 in each direction. 

You would also have to add in latency for the buffer size on the MAC.  If it was a low buffer and you kept it to 32 samples then the added latency would be around a 1/3rd ms.

Therefore, for the best case scenario, using the DN9630 as an insert, you will get a minimum latency of around 5ms.