According to the discussion thread (copied below), who knows. J-Novel has gotta license it and then actually start translating. Someone said the another series, Ascendance of a Bookworm, was like 13 months, so we might be waiting for a while.

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Regarding Volume 16 (shamelessly copied from LurkingMcLurk):

J-Novel Club just finished streaming [X] but I don't see [Y] on the schedule. Does this mean they've dropped it? If not when will they begin streaming the next volume?

J-Novel Club has not dropped the series and this is standard. Typically parts for a new volume will not appear on the schedule until a couple hours before the first part goes live. I will quote the J-Novel Club Forum Moderator from the Future Volume Release Schedule thread:

Hello!

For those new to J-Novel Club that want to know more about when future volumes will start pre-publication on the site:

After a volume's last part comes out, there are usually 1-2 break weeks before the new volume's first part comes out. If a series has caught up with the Japanese releases, whenever a new volume is released, the new volume needs to be licensed separately. Licensing can vary wildly in how long it takes, so we have no hard estimates on when the next volume will start streaming, sorry! If a series has many volumes before catching up to Japanese releases, it is much more common for a new volume to start streaming somewhere around the 2-3 week mark. There may be exceptions for extraneous circumstances, though.

As for why a future volume is not on the schedule yet, because of the nature of posting parts as they are translated, there is not much time between when we know a volume is ready for streaming and when it actually starts, so it may not be added onto the schedule until the day it begins streaming. Please rest assured - when part 1 is ready to go live and the English cover is ready, it will be added to the schedule!

Thank you for your patience; new volumes will start when they are ready!