Albeit a little late, here is some data supplied by Dainese regarding Lorenzo Baldassarri's accident at Assen.
The team Forward rider lost control of his bike at 186 Km/h and was in the air for 5.8 seconds, covering a distance of 212 metres. He impacted the ground with an acceleration of roughly 15g.
The airbag activated in 1040 milliseconds (more than a second) before he hit the ground.
What would the outcome have been without this active protection? We don't even want to think about it!