How early is too early?

A few friends and I are going to the show in Irving, TX on 8/29 and were wondering how early is TOO early to line up at the venue? A couple of us have triple platinum VIP and the other two just have gen admission. The goal is to get to barricade which is probably already likely for us with VIP while the others with gen admission don’t really care either way, but trying to decide on a time to get there early enough to be the first few in line without having to stand out there for more than 4-6 hours.