Time spent will be determined by the service you are providing. One thing not to overlook is that what is not spent on paint polishing/sealing will be spent cleaning and dressing that awful expanse of trim. I'd charge extra just for it sitting in my drive, and the possibility of someone thinking it was mine.

Edit: I see you clarified a bit. Well, you also have the additional time required to pull out a ladder to reach the roof area. Since you will be polishing you will have to do some taping off of the trim area mentioned above, and IIRC there is a lot of it.