When Bob and his kids (re-)enter the cemetery, the sun is setting in the west. When the Belchers eventually leave the cemetery, there is a full moon setting in the west, too. This would mean the Belchers stayed an entire night at the cemetery since a full moon moonset can only occur in the morning hours.
Linda displays an aversion to cemeteries yet in Weekend at Mort's (2011) she was quite keen on staying at a funeral home.