Not exactly sure but ..
Fundoo,
I have not done mine (not even approved yet) but basically I think stamping requirements are the same everywhere.
Take your passport, 2 ADIT style photos, courtesy or original approval notice, I-94s, EADs, AP papers.
As far as time, don\'t know but I would recommend showing up at 6 am and just waiting it out. Get the stamping done and be free till you get your actual plastic card.