Each new chapter usually takes around a month and a half, and I always make sure to keep all paid patreon supporters informed about the state of development. If it's going to take more time, I also try to warn them in advance.How often are updates released?
But for chapter 4, it will take more time. I'm currently traveling and will be back at the end of january, so chapter 4 will likely be released at the end of february or in march.