Need Help Converting SQL Report Writer Code to SWQL - Down Time Duration

Here is Report Writer SQL code that produces the duration of down time for a node.  I need to be able to convert this to SWQL and populate the 'hours down' time into a custom property field.  I want to use the 'hours down' time custom property field in conjunction with changing Google map Icon colors once time frame meets specified thresholds.   I'm not very savvy with SQL or coding so all suggestions are welcome.  Thanks everyone.  

SELECT     DATEDIFF(hh, T1.DownTime, CURRENT_TIMESTAMP) AS HoursDown, Nodes.Caption, Nodes.IP_Address,

T1.DownTime, Nodes.NodeID

FROM         (SELECT     MAX(EventTime) AS DownTime, NetObjectID, NetworkNode

                       FROM          Events

                       WHERE      (EventType = 1) AND (NetObjectType = 'N')

                       GROUP BY NetObjectID, NetworkNode) AS T1 INNER JOIN

                      Nodes ON T1.NetworkNode = Nodes.NodeID

WHERE     (Nodes.Status = '2') AND (Nodes.Owner = 'RHD')

ORDER BY HoursDown DESC, Nodes.Caption, T1.DownTime DESC, Nodes.NodeID

Output from this Query: