If working on the project gives you peace and joy, then it really isn’t “work” IMO.
If it’s just one more thing you have to do, then it might not give the same benefit.
It’s like if you’re doing it because you love doing it, vs doing it because it needs to get done and that’s what you have to do. Is it the destination that gives you joy/peace/security or whatever, or is it the journey? Or both? When we work “for a living” then we are toiling to provide our “needs” so I think it takes on a feeling of enslavement. You need a day to feel free, and once a week seemed like as good a plan as any for God to recommend.
Alan