As someone who needs GPS a lot for work, having it on the large display is very nice. I think the sweet spot is around 7 inches; big enough for maps, but leave enough space for everything else.
The best is when they display the “next step” right on the dash. Too bad my work vehicle doesn’t do that.
Probably 10 minutes, but by that point they had to double down for the shareholders and as long as everyone copied, they were good.