3 sessions, about 4 hours each. same for chapter 2. chapters 3-4 were 2 sessions each, chapters 5-6 both done in just one session. this was the first these players had any experience with Cthulhu, none were even familiar with Lovecraft, and were hardcore powergaming D&D players, so once they decided it was "best" not to look at anything or talk to anyone, it started moving much more quickly.