Mariah season is getting shorter.

Listenership numbers shows Mariah Carey’s “All I Want for Christmas Is You,” which had been expanding its measurable listenership into Halloween season, has this year retreated from its October ambitions and loosened its grip on November, according to data from music-tracking site Last.fm.

This data, which captures 20 years’ worth of the song’s listenership among Last.fm’s millions of members, shows the percentage of the site’s daily listeners…