Honorabl evez, please see that many of the theories of west have proved inapplicable in pakistan. however i appreciate your issue raised of time lag is a perfect topic for a research paper, by analysng impact of DR on inflation in pakistan and the time lag factor involved in it.

Till we have empirical support by time series analysis for pakistan, i am unable to support the argument that it will take 2 years as the time lag.
however, if it is proved by research being a student of economics till last breath, i will be willing to make corrections in my point of view.