Log source stopped reporting from last (x) days

I am trying to create a view to have time difference between <now()>  and <metadata.ingested_timestamp(max) Time> value. And to then set an alert, dashboard etc when value of  <time difference> is greater then (X) hrs. 

While i am doing so getting strange values in time diff. Anyone can suggest what i am doing wrong here.????

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Time difference custom field code expression

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