The last thing I read was that Ocean was looking at about 6 seasons with 5 chapters/season so 32 chapters might be the best estimate out there (I don't follow the Wiki so I have no way to know how frequently it is updated).
I do know that Ocean has spent significant time in the last 18 months advancing the story in SG while redoing CH 1 & 2, as well as adding in continuity work and adjustments due to music licensing issues.
The rework of SG Season 1 is due to wrap up with the CH 5 Final release which we believe will hit in Jan 2024.
This extra work is all in preparation for a Steam release.
If the Steam release goes well, it will provide a significant resource bump for Ocean, and this will in turn help with his ability to pay for help as well as buy hardware and music, for example.
Ocean said that the rework will be complete with CH 5 Final, which means that we have every reason to believe that we will get content updates more frequently. 100% of Ocean's effort will be able to be put into the latest chapter (a great Steam release will, IMO, positively impact SG in a number of ways, including update frequency).
Is this still a Very ambitious project that will likely take two decades to get to completion - Yes.
As a supporter, I'm happy to support Ocean as he creates this story and shares it with us.
I believe that the great renders & animations, music that has found its way onto several of my playlists, and deep story make my $ very well spent.
BTW - he has already begun sharing early work (renders created) for CH 6, which is being developed while Ocean works on wrapping up CH 5 and releasing
CH 3 of WIAB (target release Dec 23, 2023).
Cheers!!