Just to keep tabs, where are we now? 1.5 months ago this patch was halfway done. Now it is "hopefully finished soon", so let's say another two weeks (my guess, not official!). So about 4 months for a second part of a filler. I understand that they weren't able to work on it continuously because of IRL problems, but i also praised them for releasing two patches in two months.
Even if those were also fillers, so it's only fair to examine upcoming patch the same way and yeah this will take 4 times longer than the other two filler patches individually.
As a personal note, allow me to have a moment of silence for Sabia's slave armor. It was shown for a minute in the last patch and never utilized while the barmaid outfit is about to get its 5th or 6th dedicated patch.