Do you think working 40 to 50 hours a week is too much?
40 is the upper limit.
Not if you love it, but if you don't (not even liking it) it is too much.
Time alone isn't a good measure to determine if it is too much. It strongly depends on the net creative output, power, body stress and physical demand. When you are a writer 60hours is ok, when you work as a nurse 40 hours is too much under the usual conditions as the overtime that is constantly demanded add up without ever any relief.
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