We rode it two days ago about a half hour after rope drop on a very busy day at MK. It was only 20 minute then but was already up to 40 minutes by the time we finished.
The pre-ride queue activity is really amazing. In fact, for me it actually made the actual ride seem a little dated, but still fun. My daughter held up her shadow hand to the shadow butterflies, and one of the butterflies actually landed on her shadow finger and stayed on her finger even as she moved it around slowly. Are you kidding me? I want to shake the hand of that programmer.