http://www.conwaydailysun.com/featur...escue-training is all about training the fire department 'how to do ice rescues' on Conway Lake in Conway, NH.
It says someone can last for up to 15-minutes before freezing up due to body type and gender? For example, wading into the icy cold, 36-degree water in just a swim suit with a 104-degree hot tub nearby is definitely doable, while breaking through the ice in water over one's head could be a big problem.