Summarize:

Place the ginger into an airtight container. Keep the container in a cool, dark place such as a pantry. Make sure that the pieces are completely cool to touch before you store them, otherwise, they won't keep well. You can keep the sugar that falls away from the ginger pieces and onto the half sheet pan. This can be used for sweetening coffee, topping ginger snaps, or sprinkling over ice cream.
Store the candied ginger pieces for up to 3 months.