I’ve wanted to go the last couple of years. I’ve always wondered how early would you suggest getting there, and how long does it take to get through the check ins?
That really depends on how badly you want your “spot”. If you’re not super picky I would leave BIR by 9am. That will give some options to pick your holes by 10am. That leaves time to get stuff ready, walk around, check out the vendors, and make friends with your neighbors.
If you’re looking at somewhere specific on the map, then the early bird gets the worm