How long do you normally have to wait in line if you have your tickets already?

Last time I was there, I was able to walk straight to the security checkpoint and go in. No wait.

when the doors open up you get in pretty fast

I've never had a long wait for Preds games or big name concerts. The longest I've waited is maybe 10 minutes.

Depending on the event..Hockey, if you are there as soon as the doors open, maybe 15 minutes..bag check and tickets scanning on your phone goes fast.. closer to actual game time longer.. Concerts take longer..but remember you can enter from Demonbreun Street also

This will vary widely depending on the event you are attending. The wait to get in for a Predator's game is usually quite short as they have all doors open and move people through quickly. Concerts can take longer, but I have never experienced a long wait (15 minutes or more).

We were there for the Willie Nelson tribute about 30 minutes past doors open so there were lots of people waiting to get in. The lines moved quickly though and we were inside in about 10 minutes or less.