It takes between 10 to 12 minutes to completely melt an ice cube on concrete with an ambient temperature of 109 degrees Fahrenheit. Ice melts at different speeds based on a range of factors such as the temperature of the ice, the size of the ice and the ambient temperature.
Ice melts at 0 C or 32 F. In order for ice to melt, it will need to absorb enough heat to raise its temperature to this level. The size of the ice affects how much heat is required. For instance, an ice cube sitting out in the sun will melt faster than a block of ice. The surrounding temperature also affects how quick ice melts.