Some applicants in this forum have reported of getting their certificates in 4 days while most others have reported to have got it within/around the 2 weeks mark from the oath date. This is without asking for expediting the service. So not sure what can be the fastest that IRCC can provide you with one.
Depending on individual's urgency passport can be availed in less than 2 days to 30 days. You can check this using the link:
https://www.canada.ca/en/immigratio...s/coronavirus-covid19/passport/how-apply.html
As per the link, for less than 2 days service you will have to call Service Canada Passport Call center while for services within 30 days you will have to submit an online form and it may take up to 2 days for Service Canada to call you back with instructions on how and where to apply.
All the best!