Nice comments Mike!
Of course, the real answer is that however the time breaks down, I spend to much time
at work.
This is, of course, a congenital disorder in most engineers; the actual work is so interesting they don't mind the extra hours it takes to get done.
I didn't note that your spreadhseet calls for you to extend this excercise to your entire day so you could include travel time etc. nor, I suppose, do they really care to know about those extra hours at the office they don't pay you for.
If I am objective (and if I am not, my wife is), I spend altogether too much time "working". Even when driving the car I am thinking about some problem or other and how to solve it.
Fag Breaks, coffee breaks and those "socialising" moments by the coffeee machine or the notice board are also actually a vital part of the work environment. These are often the oil that helps the "machine" run smoothly. Take them out and, assuming there is no strike, see how productive the workers are (if you can illiminate the "bolshy" response from the test)
In fact, in the early days of the cotton mills and before "Working Time Directives" or parliamentary legislation about working hours, a mill owner did his own study of his workers hours. He decided unilaterally (i.e. bfore the governement actually legislated) to cut the working hours down to about 12 a day (can't remember the details, someone will remind me who it was and what the actual details were).
The result?
Productivity went up.
In any excercise like this you need to ask if the right things, all the right things and nothing but the right things are being measured and why. Then ask what do the results tell you?
Do you get to compare to your managers time sheets? Boy, that would be illuminating. You results are meaningless in isolation.
As Ashereng says, it is results that count. How do they measure that?
PS a curious management blind spot, the notice board. You can spend all day there and they can't complain: they put it up and they fill it with dumb notices and charts so hw can they then criticise you for reading them?
JMW