Monthly/Quarterly Business hour SLA Report

I recently attended a SolarWinds webinar about Business hour SLA reports thru SWQL. This is the query they provided:

SELECT N.Caption, DATETRUNC('day', TOLOCAL(N.ResponseTimeHistory.DateTime)) AS Day,

SUM(N.ResponseTimeHistory.Availability*N.ResponseTimeHistory.Weight)

/SUM(N.ResponseTimeHistory.Weight) AS SLA_Availability,

    N.CustomProperties.time_start, N.CustomProperties.time_end

FROM Orion.Nodes N

WHERE HOUR(TOLOCAL(N.ResponseTimeHistory.DateTime)) >= N.CustomProperties.time_start

    AND HOUR(TOLOCAL(N.ResponseTimeHistory.DateTime)) < N.CustomProperties.time_end

GROUP BY N.NodeID, N.Caption,

    DATETRUNC('day', TOLOCAL(N.ResponseTimeHistory.DateTime)),

    N.CustomProperties.time_start, N.CustomProperties.time_end

I would like to take this a few steps further. First only Monday-Friday (excluding holidays would be great, but I feel that would add to much complexity to what is likely an already complex query). Second I would like it to give me the Monthly or Quarterly SLA for a node. I have it returning data from the first quarter and only Mon-Fri, but I am unsure how to go about consolidating the data to a Monthly or Quarterly average. Also I have to limit this to only one node when using the SWQL Studio otherwise it times out after 2 minutes.

SELECT N.Caption, DATETRUNC('day', TOLOCAL(N.ResponseTimeHistory.DateTime)) AS Day,

SUM(N.ResponseTimeHistory.Availability*N.ResponseTimeHistory.Weight)

/SUM(N.ResponseTimeHistory.Weight) AS SLA_Availability,

    N.CustomProperties.time_start, N.CustomProperties.time_end

FROM Orion.Nodes N

WHERE HOUR(TOLOCAL(N.ResponseTimeHistory.DateTime)) >= N.CustomProperties.time_start

    AND HOUR(TOLOCAL(N.ResponseTimeHistory.DateTime)) < N.CustomProperties.time_end

    AND WEEKDAY(TOLOCAL(N.ResponseTimeHistory.ObservationTimestamp)) IN (1,2,3,4,5)  

    AND QuarterofYear(DATETRUNC('day', TOLOCAL(N.ResponseTimeHistory.ObservationTimestamp))) = '1'

GROUP BY N.NodeID, N.Caption,

    DATETRUNC('day', TOLOCAL(N.ResponseTimeHistory.DateTime)),

    N.CustomProperties.time_start, N.CustomProperties.time_end

Any help or guidance would be appreciated.