The Christmas trees display period varies a lot, with some of them dismantled after the first Christmas day, while others are maintained until February, for the Valentine's day.
Many of them are not real trees but works of art, with some places featuring beautiful designs made to harmonize with the surrounding landscape, such as this one displayed at the Umeda Sky Building in Osaka.
EXIF info:
Nikon Df
Lens: 14mm F/2.8D
Focal Length: 14mm
Aperture: F/7.1
Shutter Speed: 1/1250s
ISO Sensitivity: ISO 8000