I think the one time I did student rush for Legally Blonde it was the one time it wasn't crazy. I think that I lucked out on that regard. I got there at 8 hung out till ten and got a ticket.
I would think that now that they reserved it for college students only that the crazies would have gone away. But, I guess not.
As for August:Osage County. I don't think you would need to get there at 7 for the rush. I would say no more then two hours prior to when the box office opens. I think the August Osage County rush is one per ID so you wouldn't need to get there that early.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll