How many nights and weekends do you work?

Curious what other folks experience with this. I’m a public librarian. I work one night a week, every 3rd Saturday and every sixth Sunday. We get time and a half (in the form of comp time) for Sundays, but nothing extra for Saturdays or evenings. We’re also expected to occasionally pick up extra evenings, although that isn’t usually more than 6-8 times a year.