Honestly, not a clue. This is actually only my 2nd con (my first being last year's Kumoricon), and my 1st working the registration side of things, so it's just as new to me as it is to many others.
I do know that it will be significantly shorter than it would if we weren't taking care of some of the registration the night before. Exact time to be determined (as I will be driving up from Eugene on Friday afternoon), but we'll have tables set up for people to take care of their registration the night before so they can just flash the badge and walk in on Saturday morning.
For the record, I highly recommend that people avail themselves of that option on Friday night if you are there that evening. It will get you through registration faster, it will shorten the lines Saturday afternoon, and it will keep the volunteers working the registration tables with a little lighter load. It's a win-win situation for everybody!
PezCat