What time to arrive to get Vinyl signed

Hey so I’m attending the show on August 1st and got GA Left Tickets. Im trying to get first row to get one of my vinyls signed (don’t know which one yet). Last Time I got second row in 2023 and started queuing at like 12 and in 2017 I had seats. It’s gonna be hot as hell in Frankfurt so Im thinking it’s possible to start queuing later and still get barricade. What’s a good time to be safe?