It took longer than a few minutes to actually sell out last year, as opposed to look like it was "sold out" - VIP tickets were doing the usual dance of falling out of carts and then becoming available again. I got one right away, but I know friends who scored VIP over 30 minutes in, maybe even an hour or more. But yeah, almost certainly same day (although I vaguely recall they made some more available later on randomly with no notice?).
was a quicker sell out for Kentucky. I remember it being pretty quick.