The duration in days between Q's posts since Nov. 13 are a count down sequence:

Nov. 13 - Nov. 20 = 7 days

The number 6 is skipped since it's (((their))) number

Nov. 20 - Nov. 25 = 5

Nov. 25 - Nov. 29 = 4

If we continue the sequence:

Nov. 29 - Dec. 2 = 3

Dec. 2 - Dec. 4 = 2

Dec. 4 - Dec. 5 = 1

>D5