In a mostly-synchronous society, “standard” working hours become somewhat desirable. Working 9-5ish typically maximises opportunities to see friends and family

In a mostly-synchronous society, “standard” working hours become somewhat desirable. Working 9-5ish typically maximises opportunities to see friends and family, and for parents it means they get to take advantage of free government-provided childcare (aka schools). Plenty of places are open outside those hours, but they tend to be shops and services provided by relatively low status workers. Higher-status service workers (dentists, bankers, ...) generally seem to do better at resisting “unsociable” hours. It’s an annoying situation, but can’t see it drastically improving without a widespread move away from synchrony.