They've only played it twice so far. Once at 11am and again at 4:25pm... seems like the song is about ~5 minutes long. I don't think many people have heard it yet, haha.
A TokyoFM Twitter also mentions playing it about 4 days ago, but... I dunno if that's legit or not. This seems to be the full song for FM Fukuoka though.
The Tokyo_FM tweet:
tokyo_fm [浜崎あゆみ] Microphone (#youtube
http://bit.ly/cy1r73 ) 4 days ago from API