Calculation of popularity algorithm from a track

[Bea899]

My Question or Issue

Hello,

I would like to know how is the calculation of popularity algorithm from a track. 

Particularly, I need to know how is the calculation based on the time. 

In the documentation of tracks, i see that "the popularity is calculated by algorithm and is based, in the most part, on the total number of plays the track has had and how recent those plays are". 

I need to know the time or the interval time that it´s considered to set a higher o less popularity. 

I am working in a study based on spotify information and this is the reason why ask this question. I am doing comparisson between songs from 2015 to 2020 and the differences in time´s consideration on popularity calculation could take wrong conclusions.

Thank you in advance

BR