It seems with X2 that most people tend to ride it either right at the beginning of the day or right at the end. The first few hours seem to be the very worst, as it appears that the majority of people in the park go straight there, making for some very long lines. The general consensus among the people in line tends to be that "it's only gonna get worse," so they wait it out. The remaining people who don't brave it in the morning seem to save it for the last ride of the day, thus leading to some fairly long lines again at night. This leaves the time period in between as an opportune time to ride X2, as lines are often much more bareable in the mid-afternoon than at other times. X2 seems to be different from the other lines in the park in that instead of starting out small and getting progressively bigger it's line starts out quite big and then gets smaller before increasing in size a bit again near the end of the day. I'm not sure if this is neccesarily always the case, but over the course of several visits in the past year this seemed to be true.