ok, modify that report with this:
with t as (SELECT
StartTime.EventTime,
Nodes.Caption,
Nodes.Location,
StartTime.Message,
DATEDIFF(Mi, StartTime.EventTime,
(SELECT TOP 1
EventTime
FROM Events AS Endtime
WHERE EndTime.EventTime > StartTime.EventTime AND EndTime.EventType = 5
AND EndTime.NetObjectType = 'N'
AND EndTime.NetworkNode = StartTime.NetworkNode
ORDER BY EndTime.EventTime)) AS OutageDurationInMinutes
FROM Events StartTime INNER JOIN Nodes ON StartTime.NetworkNode = Nodes.NodeID
WHERE (StartTime.EventType = 1) AND (StartTime.NetObjectType = 'N') AND
eventtime between dateadd(month, -1, getdate()) and getdate())
Select *
from t
where t.OutageDurationInMinutes>60