Going for RealID at Whitehall DMV tomorrow, expected wait time?

Title explains. I haven't been to this DMV and when I tried like two weeks ago a little after 10 am there was a line of about 20 people outside the door so I just went home. I plan on showing up a bit before they open this time just in case, but I'm not sure if I really need to in case the line actually moves fast and I just had a poor first impression. Thank you!