Hours vary little throughout the year.
Banks 8am–3pm weekdays, to 11.30am Saturday; some take a lunch break
Offices and museums 7am or 7.30am–5pm or 6pm; museums generally close on Monday; most take a lunch break (roughly 11am–1.30pm)
Temples and pagodas 5am–9pm
Vietnamese people rise early and consider sleeping in to be a sure indication of illness. Lunch is taken very seriously and virtually everything shuts down between 11.30am and 1.30pm. Government workers tend to take longer breaks, so figure on getting nothing done between 11am and 2pm. Many government offices are open till noon on Saturday, but closed Sunday.