While every chapter is different, in general the chapters take about four to eight hours to complete if you review the text portion (skim or read depending on what you need), do any questions in the text, take and throughly review Phase 1, take and throughly review Phase 2, and then take and throughly review Phase 3. The most important part, and it will definitely take time, is to throughly go over every question and analyze how you would best solve it if you ever saw something like it again.