Go and see it in real life.
Google is good but there's a whole lot you'll not see.
A college we do takes 3 lads 2 days to do. They're fine with it.
Ask your college if there are any restrictions. Tell them you expect to take 2 days but could be more could be less. Just be open with them.
In my experience, the little hitler types tend to be a junior schools.
College's & University's-they tend to be more professional. And care little about how long you're there as long as they're under budget and the cleaning is ok. (Not even perfect, just ok)