Any characters with significant content averaged about 4-4.5 months for update release in the 3 years that led up to the start of the work on the Tech Update.
I wouldn't expect it to be quicker whenever content updates start back up again. Should it be quicker, you can be pleasantly surprised. However, I wouldn't recommend getting your hopes up.
Even if all the art and writing are ready when Tech Update is completed, it all still needs to be posed and coded... and that will be what will take the time. Art is not the bottleneck.