Quickly run into the gap as the ceiling comes crashing down from above. If you make it in time the ceiling will rise up again and then crash down again and again, each time with the gap in a random place. How long can you survive?

Quickly run into the gap as the ceiling comes crashing down from above. If you make it in time the ceiling will rise up again and then crash down again and again, each time with the gap in a random place. How long can you survive?