That’s an easy question: way longer than you want it to take. The court system is not noted for it’s alacrity for handling cases on time.
We practice law in the bigger counties in the central part of Oklahoma. In these counties there are a lot of divorce cases filed every year. In Cleveland County the case filing generally amount to approximately 1,500 per year, where you can have over 3,500 filing in Oklahoma County. In the smaller counties we serve such as McClain, Garvin, Grady and a few others there are much fewer filings, but there are also much fewer judges to handle the case load.
In our experience a contested divorce can take up to 6-9 months from filing to trial. Then it can take weeks or ever years to get the final paperwork drafted, presented and filed.