We have seen in a previous post how to get the best configuration for a local calibration (Min and Max number of samples and factors). See: LOCAL Equations with Win ISI 4 (Part: 1)
We have a RED file which has the math-treatments applied, and a reduction of the number of data points if necessary. This RED file can have also a certain range of wavelengths (NIR, NIR + VIS,..., or selected ranges into these areas). The better prepared the RED file, better and faster results we will get.
Of course the predictions will change depending of the RED file, so it is important to check with trial and error the best configuration for this file before to implement it in routine.