As someone with handicap plates myself it takes me about 10mins. A word of caution though I have gone on days where all spaces were taken and the walk almost doubled in time.
I'd say about five minutes, not including screening time.
This really depends on the person with the disability. It shouldn't be more than 5-7 minutes walk assuming you don't park far away. Security and temperature scan is quick.
Umm...1 min maybe depending on how fast the person walks...
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