How long can one person stay frustrated and do a good job?
Not very long because they will be at some point so frustrated that they just don't care anymore.
by relaxed, I mean that you can focus on your work and get it done without stressing about it.
If you think all the time that this job sucks or that you will not finish it then you are thinking about stuff that does not help and also takes away from the focus of the main goal. So yeah relaxed people that can focus on getting things done are usually in the long run better.
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How long can one person stay frustrated and do a good job?
Not very long because they will be at some point so frustrated that they just don't care anymore.
by relaxed, I mean that you can focus on your work and get it done without stressing about it.
If you think all the time that this job sucks or that you will not finish it then you are thinking about stuff that does not help and also takes away from the focus of the main goal. So yeah relaxed people that can focus on getting things done are usually in the long run better.