Ask HN: How do you manage projects

I have a question for the startups here. What process do you use for managing/scheduling projects. I work for a startup where the CEO is a non programmer and,each time there is a new feature request from a customer or an idea for a new project, his only input seems to be "Get this done ASAP". Because of this it seems like the to-do list keeps growing, and I've been working 14-16 hours a day, 7 days a week for the last 3 months. Of course, if I ask him for time off, all he does is wave the to-do list at me. How do you manage schedules. The system this company is using is too chaotic to be successful.