First time camping for a drop AP x Swatch "Royal Pop" .Graz, Austria. How early is "early enough"?

Hi everyone! I'm planning to head to Graz (Sporgasse) for the upcoming Audemars Piguet x Swatch release on May 16th.

I'm a complete newbie to the watch world and this will be my first time ever waiting in line for a release. My plan is to take a bus from Croatia and arrive in Graz around 11 PM the night before (Friday night) and wait until the store opens at 9:30 AM.

So my queston is how early should I realistically be there?

'll be upfront: I'm doing this primarily to flip the watch and make some quick cash. I've seen what happened with MoonSwatch prices and I want to get in on the action.