That depends on a lot of variables, including what exactly you're having done (I see you haven't decided about your ovaries yet) and what they find when they get in there (for example, adhesions, endometriosis) ... best to ask your DR. In general, da Vinci surgeries take a little longer than more traditional surgeries because of the time required to set up before surgery begins.
I was told to expect 2-2.5 hours. I'm planning on adding an extra hour to that range for the extended family - my folks are ones to flip out if things take too long. There are all sorts of reasons these things can take longer! I'll be curious to hear how long it was for other women here.
I'm so glad you asked this question, I was curious myself. I am having it done on Friday, both ovaries removed, davinci assisted vaginal hysterectomy. I anticipate mine will take longer due to surgical adhesions and because as I've learned over the years, nothing is textbook with me!
My Dr explained that the surgery is not as long as getting the robot ready. But mine took over 3 hours, surgery was at 7:30am did not get into my room until 12:30, I was surprised at that. I had severe scar tissue, everything was removed.