Hi,
Here is our experience with IRCC/NDVO
Passport Request: 12 MAR 2018
Passport Send on 16 MAR 2018
Medical expiry : 11 APR 2018
Got call from NVDO : 30 MAR 2018 & 3 APR 2018 for Medical Clarification ( retake or would be able to fly on or before 11 APR 2018)
NVDO send back the Passport : 04 APR 2018
Re-medical : 09 APR 2018
Resent the passport : 09 APR 2018
Medical approved : 17 APR 2018
Your Dr has to upload IME form to IRCC , in our case it took 5 working days, and in a day or two , medical status got changed to " Medical Passed".
As a proactive steps from IRCC might have requested for re-medical which will help you to get enough duration in Visa( Visa stamping date depends on ur medical expiry date) for ur first entry to Canada.
Hope that i answered.
Rgds,