I know Stephen King is uncompromising on the idea that writers should practise their craft every single day, and it clearly works for him. Personally, I relish a day off with some boredom; it gives me space to feel the world, observe, stir up the epiphanies, which I need if I'm creating fiction. On the other hand, I'm a big advocate for beauty and creativity on the weekend, which can be incredibly rejuvenating.