I can't split an activity for it to be finished in days. Are you the same?

If I'm at a task, it has to be done the same day. For instance I'm starting to prepare a bullet journal spread. It involves considerable amount of craft work. I can't give it "an hour a day" because that means having to form tempo every single day and then having to snap out of it after an hour. And what if the work quality is different on different days? Some days I'm feeling super creative and other days I'm not. Are you like this too? How do you deal with this? It feels like my whole life stops when I have a goal to achieve.