HD videos take a lot of bandwidth. Spotify's default quality (I guess the highest you can get with the free tier) is only 96kbps. So if you stream that 24 hours

HD videos take a lot of bandwidth. Spotify's default quality (I guess the highest you can get with the free tier) is only 96kbps. So if you stream that 24 hours a day it takes: (96 / 8) * 3600 * 24 / (1024 * 1024) = 0.99GB