Assuming you're referring to a bread machine:
The average bread machine will last around 15 years with proper care. Of course, how often you use it will affect its longevity. Some tips to prolong the life of your bread machine include:
-cleaning it after each use
-storing it in a cool, dry place
-being careful not to overfill it
-not using it for anything other than bread dough
Of course, accidents happen and bread machines do break down from time to time. If yours breaks down before the 15 year mark, don't despair. Most bread machine manufacturers offer at least a 1 year warranty on their products.