Years after the story about how long it took Mariah Carey to write All I Want for Christmas is You circulated, she has set the record straight. It is one of the biggest Christmas songs ever made, breaking dozens of records. Naturally, Mariah became the ‘Queen of Christmas’ (when she posts her video of her breaking ice and screaming, “It’s timeeeee!” you know the festive season is near). But the idea the music star and her songwriting partner made it in such little time isn’t strictly true. Mariah Carey’s producer says they wrote All I Want for Christmas is You in 15 minutesWalter Afanasieff, a…