Stopping distance
Angelo,
I don't fly the b206 but like sycamore says, a lot depends on pilot skill etc. certainly in the lynx if you have 15kts airspeed on a still wind day you can pretty much stop within a rotor span. The limit to how quickly you can stop (in the lynx at least) depends on how much nose up (aft cyclic) you can achieve without entering autorotation (because as you flare you need less collective pitch to maintain height). This however is not going to happen at 15kts because the aircraft has less energy than at say 60kts.
Also consider how much nose-up you can have without striking the tail. Forward visibility is less of an issue if you can judge where you are out the side window.
the key point is to have an overshoot so that if you misjudge the approach for any reason you are not committed to landing.
What is the context of your question?