I'm specifically asking about full-time teaching staff (unlike part-time teaching staff such as professors, who as I understand it can just spend more time on research during semester breaks).
I understand US universities pay their professors only 9 months a year, which effectively means they're free to do whatever they want in the remaining 3 months. Does this apply to lecturers too? If so, since professors acquire funding so they can continue to draw a salary during these 3 months, do lecturers also have funding targets? In that case, are they even full-time teaching staff (since they also have to do research to actually acquire funding)?
What about non-US universities where staff are paid for the entire year?
From what I know about high school, there are some duties that teachers must do during the semester breaks (such as grade exam papers & discuss what to teach next year), but they are few. Once these duties are done then teachers have no duties - they don't have to show up to school - so they usually take the chance to go on holiday. However, at least in the high school I studied in, these periods are short - there's a maximum of 2 months of teaching downtime in the academic year (this neglects the afore-mentioned time taken to grade exam papers etc), which is well below the downtime at university. Surely lecturers don't just go on holiday for 3 months (they must run out of annual leave)? But if they don't go on holiday, what do they do?