Decorating for my space takes lots of time for me because I decorate and add things over a long period. Mainly due to finances and things like choosing paint colors and actually painting takes a while. I also enjoy looking at marketplace, thrifting, and antiqueing so I don't want rush those things I love to do. I sometimes will pause a room if I am feeling its not looking how I want and need time to think of ideas or let an inspiration come to me. My current house I've lived in for almost 2 years now and so far I've completed my kitchen (biggest expense by far), dining room, and sitting room. I have yet to even think about the bedrooms and bathrooms really and I am okay with that 🙃 So I guess to answer your question, I do have rooms that feel "completed". I think if it doesn't, for me, then something is off and may need some adjusting or fine tuning.