I’m not here to pasken, but I’d assume that if those teachers that barely get into the teachers’ room it’s because they used the beginning of recess to answer students’ questions or otherwise provide individual attention THEY ARE NOT SHORTING THE STUDENTS/PARENTS AT ALL.
Not allowing time to drink a cup of coffee would be counterproductive. If they’re simply overstaying the allotted time it’s a different story…
Also, I used to hate it when teachers allowed the lesson to continue into recess time. If that’s the reason they’re short on time my sympathies are with the students.