My daughter's class has 18 students so don't know if they'll go for 9x2 with this split one week in one week out system.
My son's has 30 which is high for here but not unheard of as some students dropped out of the parallel class last year so they put everyone together.
I teach 10 -12 year olds and in my school 28 is the max class size. But we still don't know when we'll be back as I wrote the focus here is very much on school leavers.
Oh and on 9-10 yr olds in their last year of primary. Which I can partly understand as they'll be starting secondary in August but otoh my 3 did nothing in their last year once secondary registration was over in Feb. Lots of projects and running around the village. Can understand the school (education ministry) wanting them to keep up a school structure and the younger primary children won't be there.