15W - I've done the great north west hm in blackpool 3 or 4 times. It is pretty flat so fast, although if it is a windy day that will slow things down. It is run on the promenade starting at the Hilton and going north. It then goes onto the lower promenade back to the start. You do it twice plus a little bit south at the start to make up the distance. People have complained about organisation but I've never had problems with this. In fact one year they actually went round and gritted after it unexpectedly snowed during the night.
