only pitocin

Holly
I'm being induced Friday morning at 4:30. I'm completely effaced and dilated to a 2. My OB said they'll skip the ripening stuff for my cervix and just start with pitocin. 
I know there's no way to know exactly, but anyone have any stories about how long it took them to dilate the rest of the way with just pitocin? 
I'm thinking he'll be here sometime in the afternoon, but I'm sure anything could happen.