I've done that a few times. Bit of a queue to get into the car parks, maybe half an hour / 45 mins - and you'll probably be in Pink car parks.
You're probably at peak queueing time, though - maybe 2-3 hours based on experience in 17 - though that was particularly tricky as the Manchester attack had been the week prior, and security may have been taking longer.
It was a hot day to be in that queue, too...
Also remember that Gate A will have lots of coaches arriving then, so queueing could take eveno longer.