But common business hours are set, as the name says, by the common business. And many things in our day to day life in the end are determined by the sun. So if

But common business hours are set, as the name says, by the common business. And many things in our day to day life in the end are determined by the sun. So if there is a permanent offset in the wall clock, business hours are going to shift to compensate. So changing the time zone might have a short-term impact, but long-term, will be compensated away. Most people have difficulties to raise in the dark, so the day to day schedule will be adjusted so that they have to raise in the dark only for a short part in the year, like 2 months. A time setting which would mean to get up in the dark for 4+ months is going to trigger a compensation. And of course, as a consequence, French people do many things "later" than in Germany, be it work, lunch or dinner times.