Can 10k planes really make it in and out in that short of time?
I'm sure there are a good number of volunteer planes arriving days before but let's assume 85% of the planes are in and out while the show is on. That's a lot of traffic. With an air show every day limiting the hours.
Time to break down the planes per day and then per hour.
Yes... And I would bet that less than 15% are arriving days before. And pretty much everyone who remains departs on Sunday - I've left by car (I only live an hour drive away) and gone back to get the plane on Monday and been the last plane on the field. Twice (at least, maybe 3x).
Now, generally the arrivals are spaced out over the Fri-Sun before the show starts, and the giant cluster that happened this year was due to terrible weather on Friday and Saturday. There are also people arriving and departing every day of the week - Some people are there the whole week, another large group will arrive before the start of the show but leave as early as Monday (some on Tues and Wed as well), and a third large group will fly in Thursday/Friday and stay until Sunday. I would estimate that there are 9K planes that come in on the prior weekend (busiest for arrivals), and 6K that leave on Sunday (busiest for departures).
Keep in mind, runway separation for the show is reduced to just 1500 feet, so the controllers can land multiple planes on the runway at the same time. The colored dots that are painted on the runway are 1500 feet apart so they have a good visual reference for minimum separation. For departures, they use both halves of the runway, using the centerline to effectively split the runway into a left runway and a right runway, and they'll line up planes as soon as the previous one starts rolling and clear them for takeoff as soon as the previous one has gotten 1500 feet away.
Either way, if you have 1000 arrivals on Friday, 4000 on Saturday, 4000 on Sunday that's an average of 308 arrivals per hour on Saturday/Sunday. If you have 6K departures on the ending Sunday, that's more like 600/hour (there's still an airshow on Sunday, though it is shortened). But, using two runways and two halves of each, that's one departure every 24 seconds, which is about right from what I've seen. It's a madhouse, but it's really fun to do and should be on every pilot's bucket list.
(I've done it about 3 dozen times now...)