When creating a .zip file for a playlist a .m3u file is added to the .zip. Part of the specification for .m3u playlists is to have the song duration in seconds in the .m3u file. Currently, instead of the song duration in seconds it is a hardcoded "-1". [Code in question.](https://github.com/nvlbg/gepify/blob/f1aa236fbb1a4296046a2757c61e9527f30d4e8d/gepify/providers/playlists.py#L108-L111)