If results release timelines from the last six exams are a reasonable prediction of future, business days between exam date and results being released to the boards (based on NCEES news history) are as follows:
1st quartile - 25 days
Median - 25 days
3rd quartile - 27 days.
So, 75% of all exam results have historically met this 27 work day timeline. Also, exam results have been historically released to Boards on either a Tuesday or Thursday. So that makes December 1 or December 5 my predicted range.
I'm not sure of the typical delay between the release of results to Boards and availability of results on the My NCEES web portal, which likely varies by State.