It’s my understanding we cannot add days beyond the last day on the calendar. In other words, I always book a vacation for the day after our last day of school with no risk of the year being extended. We have gone over our allotted emergency days several different years (last year we used nine emergency days and only built in the required five) and have never been required to add days or time to a school day.
No I got ya on that for your area
I was speaking about the differences in the above quote of mine and what information you gave about your area which differs.
It's a way of life here in my area the adding days or hours.
For informational purposes if it makes more sense here's my state's law which I know from your comments differs from your area:
"not less than 186 school days for pupils attending kindergarten or any of the grades one through 11 and not less than 181 school days for pupils attending grade 12."
"Subject to a policy developed and adopted by the board of any school district, the board may provide for a school term consisting of school hours. A school term provided for in a policy adopted under this subsection shall consist of:
(1) For pupils attending kindergarten, not less than 465 school hours in each school year;
and (2) for pupils attending any of the grades one through 11, not less than 1,116 school hours in each school year;
and (3) for pupils attending grade 12, not less than 1,086 school hours in each school year."
So a school district may find themselves needing to make up the time somewhere. If they've adopted the number of hours they may add minutes or hours to days to avoid extending, if they are by days they may remove days if they can from spring break (occurs mid-March) or add days to the end of the school year; typically they don't want to remove the whole spring break but I do remember one year growing up (long before you could switch to hours rather than days) they removed the whole spring break because it was just an awful weather year.
All of the above is under normal circumstances no one knows what they'll think about doing due to this virus.
ETA: Again not disputing what it is in your area though