A couple of updates on the oven--and love of my life.
Heat up time is less than three hours. I have yet to just sit and focus on heat up without distraction. I think I could probably get it up to fill heat in 2.5 hours if I wanted. For newbies like me, the critical part is the first hour or so. You should make sure the fire is going will during that time (enough air, the right size wood). After that, it almost runs itself.
I have yet to try the lower door insert, because I like watching the fire with the big opening. Next bake I will try it.