Not sure where your coming in from, but I live in summerlin and it generally takes me longer to get from boulder highway/russell to the stadium lot than it takes from summerlin to boulder highway. It was better last year but still not great. Getting out can be just as bad.
I get there 4 hours before for tailgating.
I drive in from Spring Valley area.
Never dealt with any excessive lines to get in or out.
I'm over in Star Nursery field tailgating area. Maybe that's why I never noticed/dealt with it.