I'm currently on my small break I take between my builds and am currently working on small projects related to Griseus. Realistically you can expect another chapter around ~3 months after the last, but this can vary. Each chapter has gotten slightly longer than the last, but they're each relatively short compared to most VN's.
First your work is amazing and one of the best vn i have ever read. and i have read at least 80 second 3 months are nothing compared other vn i have read and its been 2 years since last update and quality and story weren't as good as yours so you are truly impressive thats all. hope for the best and i can't wait for the next chapter