In engine failure, how much time to lower the collective in R22 ?

In the R22, RHC state that the event of a power loss at maximum continues power, the rotor system will stall in 1.1 seconds if the collective is not lowered. A lot of pilots interpret this as they have 1.1 seconds to lower the collecctive. It is incorrect because once the rotor has stalled, recovery is impossible. In reality, the collective has to be lowered within approx 0.5 sec in order to be able to maintain RRPM within recoverable limits.

Ref: http://www.pprune.org/archive/index.php/t-502459.html