For the community to function it must have a regular predictable cycle to the days. In fact for a new community such as the one being suggested it is vital to build in a sense of time and place for work study, play e.t.c.
Habitual routines are very good for keeping us motivated and stop us procrastinating in addition to this they keep our sleep, wake and digestive cycles in time. The disruption of sleep patterns and lifestyle have been shown to have deep effects on our levels of concentration, and our levels of energy.
It is worth mentioning that different people have different optimal hours of working and there are many studies that could be done to correctly find the optimal hours of work, research, practice and exercise, tailored specifically for the individual.