Any tips about pax

me and a couple friends have bought tickets and are going to PAX
this would be my first time at a gaming convention
I plan on going to about 4 panels but when is the right time to start waiting in line for a popular panel such as roosterteeth how long do i have to wait before it starts 1 hour, 2 hours
3 hours. I know almost nothing

Also if there is anything else i suhould know before i go?
thanks ahead

Haven't been to PAX, but I've been to Blizzcon, so here's some tips anyway.

Determine how much you want to see certain events, and plan to set aside lots of time to go to them. PAX has a much higher attendance than Blizzcon, so I imagine all lines are multiple hours long. Bring a DS or PSP with multiplayer games to play with your friends, or find local wifi games. Bring bottled water if they allow you to. Wear comfortable shoes. Bring cash in case credit cards aren't accepted at vendors (More a concern for food vendors than goods.)

Asking other attendees tends to be a good source of information at the con, since many people will have gone before (Although this is the second PAX East, if I recall, so it might not be so common.).