Which change could shorten the time needed to melt the ice completely?

To shorten the time needed to melt ice completely, increasing the temperature of the surrounding environment would be effective. Additionally, applying salt or another melting agent can lower the freezing point of water, accelerating the melting process. Increasing surface area by breaking the ice into smaller pieces can also facilitate faster melting, as more ice is exposed to warmer air or water. Lastly, introducing heat sources like heated water or air can significantly speed up the melting process.