The Ossuary: From April to September, from 8:00 AM to 6:00 PM (it opens an hour later on Sundays); from March to October, from 9:00 AM to 5:00 PM, and from November to February, from 9:00 AM to 4:00 PM.
The Chuch of Sedlec: Between April and October, from 9:00 AM to 5:00 PM, and between November and March, from 10:00 AM to 4:00 PM. In both cases, it opens at 12:00 noon on Sundays.