So I did some research, and the Piano Remix might get released Friday, a week after the recording.
The only comparable situation to this I could find was Lady Gaga's DWUW remix with Xtina:
Quote:
After Gaga and Aguilera performed "Do What U Want" on the December 17 finale of The Voice, Aguilera recorded her portion of the revamped single in the days before Christmas. On December 24, 2013, Aguilera posted on her social media accounts the following sentence: "Working on something special... Happy Holidays to all!! XoXtina" with a photograph of herself in a recording studio. For an article for Billboard, Interscope head of sales, Gary Kelly, explained that they wanted to release the song sooner but "by the time it was mastered and approved, iTunes was shut down—they weren't accepting any products." This led them to release it on all virtual stores on January 1, 2014. The artwork keep the original layout but with a photograph of Christina and Gaga performing on The Voice finale. It was taken by Trae Patton for NBC Universal Media.
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Granted the timing was weird here because of the holidays, it still gives us an idea of how long this process can take
