Meeting fatigue

This week isn’t all that different from any other week, as far as work goes. I realize meetings are part of my job, but I didn’t realize that going to meetings IS my job. At least it feels that way many days.
I was looking back at my work calendar for this week and I added up the time scheduled for me to attend one sort of meeting or another. Altogether, I will have spent 8.5 hours of my 40 hour work week in a meeting. Granted, the week isn’t over so more could be added (or some, please please please, removed).
Do my supervisors understand that attending meetings keep from doing my ACTUAL job? You know, the areas and tasks and functions where I have expertise? That for every hour of time scheduled for attending a meeting that it probably (I’m estimating here) sets me back about two hours of productive time (provided I actually feel like being productive…see recent posts…I am doing effort less…)?
Do other jobs require this much time in meetings? I mean, jobs that aren’t a supervisory type job. We all know supervisors spend lots of time in meetings because they don’t actually have a job or job functions. But that is neither here nor there.
My point is, how much time do you spend in meetings each week? Is this normal, to spend the equivalent of an entire work day in meetings each week?