* The age of the students: Younger children will have shorter lessons than older students or adults.
* The type of school: A primary school will have different lesson lengths than a university or a private language school.
* The specific curriculum: Some schools might have longer lessons focused on specific topics, while others might opt for shorter, more frequent sessions.
* The country: Lesson lengths can vary by country and even region.
You could find lessons ranging from 30 minutes to 90 minutes, or even longer in some cases. To know the specific lesson length, you'd need to check the timetable or curriculum of the particular Chinese school you're interested in.