I teach at university level and my students just will NOT leave me alone in the time I have scheduled as a break! And it is actually supposed to be a break not office hours etc. I've been timetabled so I teach a max of 4.5 hours back to back (read without eating/a loo break) which at 32 weeks pregnant is just about doable but today I do 3 hours, 1 hour as an early lunch/middayish break and then 3 more and if it's anything like Monday or last week I won't have a moment.
I can't cope with not having that time, even 10 mins of it would do, but they have questions afterwards and some even try to come and see me when I'm teaching other classes so they come back at the end and need things explaining so I'm still in the classroom and people arrive early for their next class and have questions and before I know it the hour's gone.
I'm not BU, am I? I know being available is part and parcel of the job but equally I need to go to the loo sometimes!