It may be more like just under two months.
I can see dozens of stations around the country (perhaps even WLTW-106.7?) going all-Christmas as early as November 1st, in part to appease retail advertisers who are worried about a terrible Christmas shopping season.
Remember that for most music stations, retail advertisers make up most of their revenues. And it's no secret that retail advertisers love to place spots on all-Christmas radio stations because of the atmosphere created by 24/7 Christmas music. And the Christmas music is a subtle reminder for listeners to "get your Christmas shopping done!".
I wouldn't be surprised if retail advertisers and their agencies will pressure radio stations that go all-Christmas each year to do so earlier this year.