I've only 1 single hour of tuition in an R22, but was told by the instructor that you have literally a second or so to drop the collective on an engine out in the R22, the rotor inertia being so low.
Apparently the R44 is a little more forgiving
Coincidently I was watching an R44 doing practice autorotations today at Berrow and it all looked quite relaxed, but of course thats no indication of what was going on in the cockpit