Kad, the OP is asking about the matinee tomorrow, at 2pm.
6:15am is probably way too early, but on the other hand, if that's your only day to see the show and you've planned on seeing it, I'm always of the belief that it's better to be too early and be absolutely sure you have tickets. Especially since I'd say get there at 8am to be sure, and less than 2 hours isn't really time to do anything else instead, so you might as well spend the time in line. But that's me.
To answer your other question, yes, it is 2 per person, so you can come back and join your friend in line without a problem, as long as you are still only buying two tickets. Just in case, if anyone has a problem, just step away from the line and stand off to the side when he is buying the tickets.
Good luck! I hope you enjoy the show!
Nothing matters but knowing nothing matters. ~ Wicked
Everything in life is only for now. ~ Avenue Q
There is no future, there is no past. I live this moment as my last. ~ Rent
"He's a tramp, but I love him."