I am running

Code:
estadd summ, iqr
But since there are lots of right-hand-side variables, and because the data is big, it just takes too much time to complete this one line.

This is time that's just wasted because I will get interquartile range of just one main variable. That is, I run

Code:
mat IQR=e(iqr)
estadd local IQR =string(IQR[1,1],"%9.3f"), replace
Is there any way to save time by not calculating interquartile range of any other variables except the main regressor?