Temperatures have plunged here in the Sunshine State, reaching night-time lows approaching 50 degrees, presaging the entropy death of the universe...which brought this to mind: cold water boot camp

Based on the data presented, you slim fit types will float off this mortal coil in 10 hours of submersion, while us full figured folks will bob around like walruses for a day and a half, reminding us that survival value is highly situational.