Are you asking about the time it takes to do the SQL query in the load script? You can get a pretty good idea from looking at the logfile.
Or you can bracket your script statements with something like this:
LET START = now(1);
do the load & sql
LET ELAPSED = now(1) - ELAPSED;
Then display the variable in a text object as "=interval(ELAPSED, 'hh:mm:ss')"
Or are you looking for how long it takes for an object to display after making selections? Those values are available inthe Sheet Properties/Objects tab in the "Calc Time" column.