No. The WHMIS certificate does not have an expiration date.
The online WHMIS course provide general education on the Workplace Hazardous Material Information System (WHMIS).
It is the employer's responsibility to make sure that workers are specifically trained to use and store the hazardous materials at their particular workplace. It is also the employer's responsibility to regularly ensure that workers are properly handling the hazardous materials that are specific to their workplace.