The laws for salaried employees and specific to teachers vary by location, though it is generally true that salaried employees are expected to work “after hours” as needed- with certain caveats and wether overtime is due or not also depends on location and status- some salaried professions in some places can be exempt from overtime pay- teachers often are in this category.
It also depends on unions. Most or many teachers at public schools are union employees and are under a contract. That contract can stipulate things like what hours a teacher is “on the clock” or what responsibilities a teacher has if any “off the clock” etc.
the age of the teachers students is also a factor- a college professor generally has no legal obligations to make sure students are supervised by an adult whereas an elementary school teacher may not simply be able to leave if a student is in their care and there isn’t another adult they can hand the child’s care over to.
So… short versions- it varies.
It also depends on unions. Most or many teachers at public schools are union employees and are under a contract. That contract can stipulate things like what hours a teacher is “on the clock” or what responsibilities a teacher has if any “off the clock” etc.
the age of the teachers students is also a factor- a college professor generally has no legal obligations to make sure students are supervised by an adult whereas an elementary school teacher may not simply be able to leave if a student is in their care and there isn’t another adult they can hand the child’s care over to.
So… short versions- it varies.