It depends on a lot of factors.
My divorce, in California, was around $400.00 and we did it without an attorney. But we had no assets (house, property, etc) or kids, and our state doesn't require a separation before divorce, so there was really nothing to do but paper work.
I actually got a lot of help at the family law section of the court house. Thats where I had to go to get the paper work, and they gave me a lot of pamphlets for free clinics on what you need to do or know to get the ball rolling.
I also know, just in case money is an issue, that my state offered an appeal for the complete cost of the divorce. If you were in a certain financial bracket they would reduce the cost by a certain percentage. So you might want to look into that too if yours is going to be costly.
Mine took 6 months and 1 day....I have no clue why they added the one day, but thats how long it took for the state to recognize the divorce. It took him a few years before he would sign all the paper work though.
If most martial issues could be worked out I wouldn't be divorced...lol.
I wish you the best of luck through this process!