Hahah ok I’m sold. 6am it is!
Ha ha ha, not that early . Unless you are going opening week, in which case that's probably correct. I think I arrived 2 hours early for Shanghai Disneyland's Grand Opening (it was a 12PM opening though so that wasn't really 'extreme' from an early sense) and that was about perfect.
I'm sure someone will nail down the "right" time. Currently Pandora seems to be 60-75 minutes. That's why I expect this to settle into 75-90 for the summertime. With the benefit of hopefully two desirable attractions and not just one for Pandora.