I'm going to merge this with the other thread in a second, but here's the answer to your questions...
You should arrive at least an hour, if not two hours, before it starts. I know that may sound excessive, but the line to enter was at least three blocks long last year. It may be shorter this year due to it being on a weekday, but I'm betting it's not a lot shorter.
I would not plan on getting to everyone. Again, that will be based on the attendance, but I doubt seriously you'll get all the players, or even most of them. Most lines are 100 people deep, and the QB line is 150-200 people deep. Same goes for the RBs. There are just a LOT of people, and a lot of players, and not much time.
Last year they had folks enter the stadium at two points, both on the south side, through the walkways that lead to the SW and SE corners of the field. There should be signs that tell you which gate will get you to which position group, like one gate takes you to the defense first and the other takes you to the offense first.
Honestly, it's a bit of a mess on the field.