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Its against the condition of your permit but 99.999% no one will find out or care that you worked 4 hours more.
 
Hi, i worked for 24 hours a week only for a week before applying PGWP and after my studies were completed.Is that ok or not


Legally you are not allowed to work at all after you get a completion later and before you apply for your work permit.

If you did it for a week, some immigration officers might not worry about it a lot... But it's still a risk and you shouldn't do that.