A little bit, but I am not sure whether it is really comparable. It's a relatively new trend here in germany (started 2002). Translating a recent article: "According to this, in 2007 only 16.2 percent of children attended an all-day school. In 2017, the figure was more than twice as high, at 42 per cent."

As I understood it (not a parent and it was not available when I was at school): You have all-day classes and "normal" classes at school. The kids in all-day classes stay together during the day and the kids in the other class go home, it is not an optional add-on. My niece is attending all-day school with a musical focus and likes it very much. All day classes differ between schools and classes, with school on 3-5 afternoons until 4 pm. Supervision is given for homework and studying for exams.