That's what we were generally seeing in March. Posted times were double the actual times we waited, or the times we estimated the SB wait would have been based upon our own historical experiences. It's hard to have an actual SB wait time, if you rode FP+. Keep in mind though that Lines/Touring Plans expected times are their prediction for times. Those can be wrong. I would look at their historical wait data for you dates and see how far off they were. It's like stock though, only a prediction, past performance is not guarantee of future performance. You can also look at the Lines reported times. The link is at the bottom of the attraction page.