High Inquisitor / time

[mtwelovett]

No: HPFGUIDX 70526

My apologies if this has been discussed before I'm still having
trouble wading through all the posting. 

How does Delores Umbridge have the time to be such a busy body in
everyone else's classes and still "do her job" ? I realize she makes
them read almost exclusively throughout, but with her thirst for
giving out trouble, I would think she wouldn't leave a classroom of
DADA students to survey another class. Since that would 1) put off an
image of a bad teacher -- not that anyone can do anything about it,
since she has given herself supreme rule through Fudge and his
Educational Decrees and 2) give her an easier opportunity to get
students in trouble by disciplining them if they don't follow her
directions, since it is easier to tell if they are supposed to be
reading, and if she did leave, that wasn't going to continue.

In the first five years, I don't recall Harry ever having DADA with
another house (never mind how it is portrayed in the films) If this is
the case in the first 5 years alone, that is 20 classes of students (4
per year -one for each house-) and that is a lot. And then you have to
factor in that they may meet more than once a week, if their course
isn't a double session (which is really two sessions back to back
anyway) so between years 1-5 there are at least 40 sessions of DADA.
Now in OOP, it is mentioned that one of the classes is an hour and a
half (Potions maybe? Sorry don't have the book with me) if this is a
Double class, which Potions is likely to be anyway since it is a "lab
based course" then classes are 45 minutes regularly, which is about
what they were in my middle school where we had 7 classes a day with
5-10 minutes between classes, plus lunch. If you go on the assumption
that that is approximately how this is set up, and a "break" would be
a class period long, like a "study hall" or something, then there are
only 35 available class slots in a week for a teacher anyway. (5 days
times seven classes) so without having 6th of 7th years even factored
into the equation, there is no way that Umbridge would have time to
play her role as High Inquisitor too. Even if it was one class per
year, that is still at least 14 classes a week (doubles counting as
two). Yet if the Slytherins for example had DADA with Gryffendor EVER
we would have heard about it, since Malfoy would make his presence
known. So something isn't adding up there. It would seem that the
"required" non-elective classes would have more than one teacher per
subject. Especially with the school being as large as JK says it is.
(which I know is a point of debate anyway) 

Anyone else have any thoughts on this? 
Mtwelovett