Yeah, the upload is waay slow, took me three days to upload 7gb. And just in case make sure you sign in/attach your acct in the app for your music to show up. Took me a day er two to figure that one out. Still don't understand why google thought this was necessary when your G-acct is linked to the phone.
GS4-I337, Nexus 4, Note 10.1, VZW Galaxy Nexus, Nexus 7, Infuse, Atrix, Xoom 4G, Evo, eLocity A7