If its anything like when I met william Shatner then people may not need to get there very early, as it felt like I was only in the queue for a matter of seconds, before my photo was signed and I was led away from him...
But you never know each guest is different, like James Masters, someone told me they had stopped giving out vertual queue tickets after they gave out over a 1000 of them and wanted to make sure everyone who got a VQ ticket had a chance to see him.
It also depends on things like, how fast the guest in questions signs things, and how much time they might want to spend talking to each person, who go up to get something signed from them. Also guests are human and they need to take breaks like us to eat etc...
The cheapest I got his auto for was £20, )ok for free if you count the programme my friend got signed for me, as I was to shy to go up and do it myself) we did have a limit on how many things we could get signed by him, not sure if it was 1 or 2 items but I only wanted one thing signed at the time so it didn't matter to much.
After having paid £20 for his auto I'll never pay £45 for the same thing. I could just about see £25 as ok but anything more then that, and I would have to say if I was going to the event I would prob just spend my extra money on the dealers tables then buy an auto from patrick...