Yup freezing is exothermic, it warms up the surrounding areas. So a lot has to do with the ratio of surface area to volume. Kind of like what the guys said above - a skinny long pipe freezes quicker than a short fat pipe that both contain the same volume of water. There is a rough number that includes normality(# of particles dissolved in water) ratio of surface area/volume, Temperature and specific heat of the solvent.
Originally Posted by Martyn
Luxury is the lubricant of life.
Put a little gravel in your travel.