Fully agree. On my last job interview, I sat in front of the committee (about 7 to-be colleagues) and the director. I said:

> I will only work maximum 30 hours a week. The reason is that I am not productive after 6 hours. It simply does not make sense for you to pay me after 2PM, because I will not do anything productive from 2 to 4PM and you are wasting money.

Everyone smiled. Except the director.

I still got the position, but the director is still hoping I will at some time upgrade to 100%. I said I will consider again after 2 years, but I doubt my perception will have changed by that time.