If Savis is running on schedule, I think it is about 20-25 minutes for the "show" to build the saber. I suggest you DON'T check in early for Ogas (do it right at 5:10) and you should be fine.
They probably will, but the issue is that you don't necessarily get to start the experience right away. If you just happen to check in as the previous group is starting, you may end up having to wait 20 min until the next one starts. It could also be, you check in just in time to make the next group with no wait. It's kind just the luck of the draw.
Also worth noting, at least when we were there, the CM checking people in was a CM standing alone with a tablet. A lot of people were waiting in line at the counter only to be sent away to check in with the other CM first.