I remember when I was about 13 years old, there was this VERY religious black woman that worked at my school. One day, we kids had a conversation with her and she mentioned that her church service started from 6 in the morning and went until 12 at night. (hard to believe, I know).
I remember saying “That’s like 18 hours! Don’t your kids get bored???”
She yelled back “I don’t care if they get bored! They gonna sit there an lissen to the Word of God!”
I had a friend who was Russian Orthodox, she told me they went to church for something like 4 or 6 hours and stood the whole time!