Normally, a colored pencil can last for around two to five years if you use them sparingly; however, you can prolong the duration. For instance, we recommend storing them in a cool and dark place since exposure to heat will eliminate the moisture and leave the pencil dry.
This can cause your colored pencils to turn brittle and become difficult to use. Nowadays, professional artists prefer to store their colored pencils in a special case that preserves the moisture of the pencils.