Duh ,,, I was using the wrong beginning & ending attributes. I was using a couple of beginning & ending integer record counters instead of my timestamp attributes.
Log_Sync_OIP.Sync_OIP_Duration=Log_Sync_OIP.Sync_OIP_Ended_ts-Log_Sync_OIP.Sync_OIP_Started_ts
Even though I have _ts suffixes on my timestamp attributes to make them stand out as such.