Read about it :What is CMAU ? and how long does it take from there generally? Please and thank you
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/standard-requirements/medical-requirements/refusals-inadmissibility/excessive-demand-on-health-social-services.html
I didn't hear anyone who didn't wait long.
I know people that their cases moved to CMAU from November 2019 and still waiting..
You may also ask the clinic that you did the medicals if they marked your medical as an excessive demand.