Are the yearly listening hour statistics only based on online streaming?

[Maud2001]

Dear friends,

I am wondering if the "hours listened" from Spotify Wrapped each year, are based on the online streaming hours only? I literally have music on 24/7, but most of my friends have way more hours? I do mostly listen to my downloaded music offline to save data...

if this is the case, can Spotify also monitor the offline music listening activity? because if it is, then it really does not portrait a representative view of everyone's hours...