I would say 4 but that would depend also on the size of events.
That's the thing; no one knows where the following P.D events are going to take place. However, with the outline provided, we could assume where some of the updates might take place.
Location Guess -
Morning:
Aiden's 4th - School, Unless 1st "Comfortable" solution is applied then the location might change.
Don Morello - Casino or Phone
Noon:
1st/2nd Side Job - Retirement Home or Myers' Residence
Dylan/Ellie - Parker's Residence
Afternoon:
Sophia/Sam - Parker or Robinsons' Residence
Sophia/Claire/Marie (with Dylan) - Claire's Beauty Salon
Evening:
Sophia/Dylan - Parker's Residence
Sophia, Ellie, and Emma/Dylan - Parker's Residence or Another Place?
If he keeps it like this, He might be able to speed it up because he has Location Models already established, but If he has to create a new location, I think we can estimate how long that will take based on the last updates. But I would guess that if he tries to beat his last render count with the conclusion of this update, then expect this next P.D. to go longer than one year in production.