The Lion Head Winter Route itself is very short - I've done it in under an hour.......it's merely a connector between the Huntington Ravine Fire Road and the Lion Head Trail, which is more avalanche-prone in the winter time.
I guess I should've clarified that the trailhead to summit takes 4-6 hours....but the actual Lion Head Winter Route takes less than 2. Sorry 'bout that.
I agree with Sewardj with particular regard to the 60-70 degree comment. This is a very misleading. I would estimate a sustained slope of around 30 degrees or so on the route in snow where crampon work and step-kicking is rather easy for an intermediate - advanced mountaineer.
In full-winter conditions, I would say that a classic ice axe is mandatory. Anything more aggressive is overkill and to impress the ladies.