Howlongtobeat has each chapter at 3-5 hours for just the main story, which feels accurate to me. There are some secret bosses and alternate storylines that will also add a few hours to the playtime.

Chapter 5 is the next chapter out of 7 total, and iirc the next chapters are supposed to release quicker than 1-4. The wait from chapter 1 to 2 was 3 years, 2-3+4 was 4 years, and 3+4-5 was 1 year.

The first 2 chapters are free if you want to give them a try. I’ve been enjoying playing each chapter as they come out, but I can’t say for certain if you will, since you already don’t like games that are released in chapters, but hopefully this information was at least a bit helpful