I did this a few weeks ago. The timing others have described seems about right. We waited in line outside probably 15-20 minutes before beginning the customization part, which would not have been a problem had it not been 40 degrees out. But as others have said, the actual game-time is probably about 15 minutes. That being said it's a pretty intense 15 minutes.
I'll note that I have had issues in the past with VR simulations inducing nausea. I used to love Disneyquest, but the clunky, ill-fitting VR helmets they used just messed with my inner ear. Not so the Void's helmets. They fit well and, after a few minutes, you really do forget they are on. You're given a vest, which actually permits you to carry a small computer on your back. Much like the headgear, you pretty much forget you're wearing it after a while. It seemed like somewhat bulky (Stormtrooper) armor.
The game was enjoyable, the VR impressive, and both DH and I came out of it giggling and with the impression that this was pointing to the future of Disney rides.
I'll provide a more spoiler-esque description below
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So, after you put on all the gear, they take you to a small room to make certain that the tech is working correctly. When you put down your visor you should see a Tron-like square grid room, and your partners' stormtrooper images. You should also be able to see your own stormtrooper hands and forearms. This last aspect is the only place where I noticed the digital imaging had occasional issues. Your hands could disappear if they weren't held very clearly in front of your face. I'm really not sure how they did this anyways, because we weren't wearing any kind of gloves.
After everyone's suits are hooked up and their avatars showing (there were several minor glitches we experienced during the setting-up process) you're ready to go. The grid disappears and you're inside the equivalent of a Star Wars ship's closet. I'll note that, though you can feel the walls that you see (obviously, because they're actually walls) there's no "texture" to them. There are, on occasion, items in the rooms that you can interact with physically. Anyways, back to the plot:
A door slides open and K-2SO tells you to come along as you're needed. Let me stress: He appears quite real. I am fairly certain they really got Alan Tudyk to voice his lines (or perhaps lifted them from previous recordings). DH touched him, I was kind of afraid to. He takes you into the next room and has you sit down while he explains the mission. A window opens to show the landscape of Mustafar (Vader's lava palace, for those who don't recognize the name).
In our game, there was a timing glitch at this point, and we had to wait a bit for the "transport" to connect up with our cruiser. DH and I were not certain whether the game-handlers (there's apparently always someone in the room with you, even if you don't see them) were actually wanting us to wait while they set things in motion, or whether us figuring how to get out was part of the simulation. But eventually the transport hooked up with our windows and were were able to step out.
Neither DH nor I was prepared for how immersive it would be. The view was 360. You could feel the heat of the lava. You were afraid to step off the "floating platform". Then you enter the empire base. K-2SO admonishes you to blend in. I commented back that it would be hard to blend in as stormtroopers since we didn't have any blasters...and pretty much at that moment I saw a rack of blasters arrayed against a wall. You could pick them up and operate them, which we did.
Of course, that's when things start shooting at you.
When you're hit by something the harness shakes and heats up. You really feel something, though it's obviously not painful. There is not a lot of room to manoeuvre. DH and I were alone, but even we had trouble finding "cover" from time to time. Luckily, the in-game stormtroopers are just as bad at aiming as their movie counterparts.
I'm not going to go into too much detail on the rest. You shoot some guys. The challenges get progressively more difficult. There will be times when teamwork is necessry. In true Disney-ride and Star Wars fashion, you are saved by lucky deus-ex-machina intervention at the last possible moment. It is a shorter exerience than I had hoped, but about as long as I expected.
Someone asked if the rooms were claustrophobic, and I would say no. I would guess that the actual rooms are fairly small, but the VR view is misleading eough to make it feel as though you're in a bigger area.
Anyways, I feel it was definitely worth the $30pp pricetag. I can only hope they expand it and/or make different missions.