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Letter validity
Officers should understand that the validity date of the letter
in no way overrides the authority of paragraph R186(w), which allows foreign nationals who meet the requirements to continue working until a final decision is made on their work permit application.
The letter has a 120-day validity from the date of receipt, which corresponds with IRCC’s service standard for in-Canada applications. Historically, IRCC meets its service standard more than 90% of the time; therefore, only a few applicants will require a new letter. Most should receive a decision before the 120 days have expired.
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Letter Validity
Link:
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/temporary-residents/study-permits/post-graduation-work-permit-program/permit.html