According to latest guidance, for multiple programs
https://www.canada.ca/en/immigratio...n-work-permit-program/permit.html#determining
"The length of the work permit should combine the length of each program.
If the combined length of the programs is 2 years or longer (or 1,800 hours or longer for DVS and AVS programs in Quebec), the work permit may be valid for up to 3 years."
You will get 16 months + the duration of all scheduled breaks, holidays etc. If the combined total is 24 months and above, then you will get 3 years PGWP, otherwise you will only get a PGWP which is equal to the number of months. For example, if you have a combine total of 22 months, then you will get a PGWP of 22 months only.