I'm a sophomore in college working on a startup with two other people (one a junior at my school, one who recently graduated), and our model is to work all day

I'm a sophomore in college working on a startup with two other people (one a junior at my school, one who recently graduated), and our model is to work all day every Saturday. We meet up around 10am and code until 7pm or so. I get all of my school work done during the week and on Sunday, and still have time to go out on Saturday night. It can be tough saying no to activities scheduled for Saturday, but this model is definitely the best for my situation.