It depends on the type of work but in general it seems the most fun to have more flexibility.

In stead of starting at 6:00 one could start between 5:00 and 7:00. Then have a break between 11:00 and 13:00 for 30 min or 3 hours, whatever the fuck you want.

This is of course assuming we would allow people to enjoy life (An Utopian idea most people would fight against)