Bias for temperature values

Is there a delay or trick to getting the internal air temp sensor value to reflect the bias value I apply.  I was able to add a -20 deg F bias several weeks ago, but when I changed it to -30 there was no apparent change to the thermometer display.  

I'm wondering if this value is read/updated relatively infrequently, and maybe I just assumed it was every few seconds (or faster).   

Not a critical question, just unsure how to interpret an unpredictable response.


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