At WDW, probably ~45 minutes, maybe longer, for POTC in summer 2014. The ride kept breaking down. This was the FP+ line too
However, this is probably an outlier.
At Universal, probably Forbidden Journey during early entry. Again, the ride was broken. After 45 minutes or so, we decided to leave. While DH got our stuff out of the locker, I realized it was up and running. I asked a CM about it and told her we had just left. She then ushered us through the castle tour line, pretty much up to the front. It was really nice. Some people behind made a snotty comment to us that they had been waiting too. I asked them if they had been the first ones at the turnstile that morning, we were, and the guy shut up pretty quick
We had gotten to the turnstile while it was still dark. In fact, City Walk hadn't opened yet when we left the room, and they held us back for a bit. So, we had really been waiting a significant amount of time.
Our longest waits were Indiana Jones and Radiator Springs in DLR last summer. The single rider lines were well over an hour on each. Our touring plans from TP were an epic fail. We know WDW much better, and never wait more than 30-40 minutes in standby. When you know a park well, it's easier to avoid the lines.
DLR can be brutal. I don't know if this is a fail for TP or Disney. When we went in summer 2013, we had a TP plan too. It said to get in the RSR FP line at rope drop. We decided to ride Soarin' first. We waited in the RSR FP line for about an hour. When we finally hit our FP window around 2pm, we then waited over an hour to ride.
This is really ridiculous and shows very poor management of the FP system for that ride. Generally, we felt the TP DLR plans were really good. We finished everything ahead of time, even with the horrific RSR waits. All of the other waits were not too bad. TSMM wasn't great though.