I know what you mean. I've been at it for over a year with mine, but I I've gone months without working on it. I tend to kind of work in bursts, where I get an idea or two but them down and then move on. I have most of this week off, so I'll probably work on it some more sometime this week.
I know if I do decide to try to get it published, and actually succeed I won't be able to work like this.
(Unless I end up another George R.R. Martin and there is like a 0.0001% percent chance of that happening.)