How early to arrive with a GA ticket?

[Ainsley642]

Hello! 
This will be my first Coldplay concert and I’m so excited! I have a GA ticket for the San Diego show but I don’t know how early I should show up to stand in line. Does anyone have an idea on when to arrive? And once you’re in line, does the staff provide a wristband with a number so you can walk away and come back later to line up in order? I’ve had experience with that method at another concert. Thanks so much in advance!