Building on previous answers, use fieldformat to display Duracion in the desired way while still keeping it as a number. Then sum their values using addcoltotals. index="cdr" | search "Call.TermParty.TrunkGroup.TrunkGroupId"="2811" OR
"Call.TermParty.TrunkGroup.TrunkGroupId"="2810"
"Call.ConnectTime"=*
"Call.DisconnectTime"=*
|lookup Pais Call.RoutingInfo.DestAddr OUTPUT Countrie
| eval Disctime=strftime('Call.DisconnectTime'/1000,"%m/%d/%Y %H:%M:%S %Q")
| eval Conntime=strftime('Call.ConnectTime'/1000, "%m/%d/%Y %H:%M:%S%Q")
| eval diffTime=('Call.DisconnectTime'-'Call.ConnectTime')
| fieldformat Duracion=strftime(diffTime/1000, "%M:%S") | table Countrie, Duracion
| addcoltotals label="Total" labelfield=Countrie Duracion
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