The length/width of runway is only relevant to the plane you're flying and the capability of the aircraft & pilot. The Ikarus C42 with 100 horses will go in and out of 100 metres in nil wind, width unimportant... that all changes with conditions and ability.
Certain pilots who fly out of long wide runways always have trouble on smaller strips, I for one will not allow a person to land on my 480m x 6m strip (I considered it a long strip) if I have any inkling that they are not capable or doing so. Here in Ireland we have multitude of very narrow and short strips that are used regularly by pilots with capable (and sometimes not so capable!) aircraft.
As I say, its all relevant to the individual/aircraft.
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