Question

When an airbag deploys, how long does it take to inflate, protect the driver, and deflate?

Answer 1

I believe the answer is: One tenth of a second
When collision happens, the average time needed for the driver's head to hit the dashboard (while wearing seatbelts) is around 0.25 seconds. The one tenth of a second timeframe is the industry standard for airbag to prevent the driver's head from hitting hard objects.