I’m not sure where you’re coming from with this question, so I’ll try to answer in the least defensive way possible.
Holidays are a product of a concept known as “work-life balance,” which assumes that living and working are two separate things, and that working is somehow instrumental to life, which happens only when you are not at work. I will try to answer the question on the grounds that the distinction between life and work is a flawed and psychologically harmful one.
“Jobs,” in the conventional sense of the word, are abstractions resulting from the abstraction of a “company.” When a group of people want to get something done, they organize their time so as to contribute toward their common goal. Because it is difficult to find people who actually care about the specific thing an empowered and entrepreneurial person might want to do, “companies” are formed to “pay” people to do things they don’t care about, which those people accept because being “paid” empowers them to do what they care about. Companies give people time off in order to placate them, so that they can continue to do good work when they are there. The best way to get someone to quit doing something for you that they never wanted to do in the first place is to stop paying them; the second best way is to make an overt gesture that says “we don’t care about anything that is important to you.” Employee retention is the only reason companies have “holidays,” and if a certain person’s work is valuable enough to let them have the time off, they will give that person the time off. It is perhaps the only civilized part of the structure of the modern “work force.”
In a startup company, when only the founders are working, a group of people work together to make something people want, in order to enrich themselves and their fellow men. They expect to gain wealth in proportion to the wealth they create in others’ lives. In this kind of situation, people work when they can because they want to, and don’t work when they want to spend their time in a slightly different manner. When they are hungry, they eat, when tired, sleep, when bored, they go for a walk. When they’ve finished creating something good for humanity, they celebrate. Holidays are an abstraction of this freedom and control over one’s time, necessary because the only way a large company can measure performance is in time, even though better work can be done in one’s own space, with those who share a common goal and the encouragement of friendship.
For all these reasons, yes, obviously believers require as much time to devote to their own priorities as “non-believers,” since they are both having their time essentially stolen from them.