Aggregation Formula - KPI

[qlikwiz]

Hello Qlik Community, 

I'm working on a KPI which would show the sum of the median runtime of all the max run dates of different procedures. 

I tried the following expressions but they both didn't work: 

Sum(Aggr( Median(RunTimeMin),Max(RunDate)) ) 

Sum(Aggr( Median(RunTimeMin),ProcName), (Max(RunDate),ProcName))

Any help would be greatly appreciated!