My last Tunecore release didn’t post on the release date which was quite annoying. It was delayed for 48hrs and it looks unprofessional to your followers/listeners when you’re advertising a specific date. I’m in the process of releasing a new song in the next week or 2 and I noticed that Tunecore recommends giving them 4 weeks to process your music to guarantee its acceptance in all stores (although you don’t have to). I also find that very annoying because when the music is ready who wants to wait around another 4 weeks. I know that most online stores like iTunes, google play take 3 days to 2 weeks to approve your music. Also Tunecore only lets you upload 16bit 44.1 wavs if that matters to you.