WDWMagic reports that there have been actors riding the 7DMT at MK while a crew shoots TV commercials about the new attraction.

That's given those watching a chance to time the ride-length, as train after train runs the tracks.

The verdict: Under 2 minutes of ride-time.

Looks like a lot of fun in those 2 minutes, but considering the likely very, very long wait-time in line for the attraction (most parts of the day) 2 minutes will go by pretty quickly!