I've been logging helicopter time since 1971, and have never logged anything other than time from hover to skids down, or 'collective up' time. Whether the rotors were turning or the engine(s) were running had nothing to do with it, just time in the air. I'm currently somewhere between 13,000 and 14,000 hours, and could probably have a few thousand more if I counted all the time I spent sitting on the ground (or on a platform) running waiting for pax, or all the two-minute cooldowns I've sat through. But I don't even know the exact total, and don't care. In any case, it's all in the air, none on the ground.