In this 2 ingredient fudge recipe, you have two choices. The fast setting choice - where you will put the fudge in the fridge to set. This saves time, rushes the process and only takes about 20-30 minutes to fully set. However, if you over chill the fudge, it will harden too much and become crumbly and dull looking. Or, you can simply leave the fudge out on the counter to set a room temperature. You will need a few extra hours for this method. However, the fudge will set better as it will retain it's shiny texture and smoothness.