sql for high bandwidth duration

I can query for the high bandwidth utilization alerts and get a count.  What I would like to do is show a chart with the total duration time of the high bandwidth alerts for each node.  Also, how can I change the time scope for the entire query?  I think this is for the month.  I would like to make it the current week. 

SELECT Caption, IP_Address, COUNT(*) AS Node_Events

  FROM [Solarwinds].[dbo].[Events]

  INNER JOIN dbo.Nodes ON (dbo.Events.NetworkNode = dbo.Nodes.NodeID)

  WHERE EventType = 5000 and Message like '%utilization%'

  GROUP BY Caption, IP_Address

  ORDER BY Node_Events DESC