As understand your requirement you get a time in sec of loading of the chart which is in your qlikview dashboard i thing it is difficult but you are able to get the table loading time of any table in minutes or seconds.
Are you looking for something like the Calc Time (AFAIK in milliseconds) in Sheet properties - Objects tab?
CalcTime
The time in milliseconds needed for the last recalculation of the object's contents. This information is only relevant for objects that are actually calculated (charts, table boxes and any objects containing formulas).
