I suggest you use a " park and ride." They cost about $40 and drop you off as near the gate as you can get. Parking in the closest lots can cost you over $100 and you have to walk further.
It really just depends on what time the game is because it taked more time when games are during the week due to rush hour traffic.
It's better to be at the stadium at least an hour before the game. Crossing 1/2 mile just before game time can take your more than 20 minutes. After that you also have parking to take care of.
I'd allow 10 to 15 min
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