I meant that nobody feels like they "have to" come in in the sense that everybody wants to come in on Saturdays.

I don't feel like I "have to" work 6 days a week - I do it because I want to. You may say that this is just because I'm a cofounder, but that's not true - I did the same thing at past startups where I was an early hire, but not a cofounder. Because I enjoyed the work, found it meaningful and loved learning. This is the kind of person we're looking for.