I thought it would take double time at least. Maybe you should do the Pre-Wedding and Trash The Dress yourself too or hide your camera under your jacket during the ceremony and sneak it out to take quick photos. If so I will call you a hero!!!!!
I just graduated with a BS in December and I had a GoPro strapped to my chest for the walk lol.
But I am going hide one for a time lapse during the ceremony.