If I fail a semester in a one-year master's course, will my course duration increase in UK?

Yes, failing a semester in a one-year UK master's program can extend your course duration.

Most universities allow you to resit failed modules or assessments. If you pass the resit, you may still finish within 12 months. However, failing the resit or multiple components can require you to retake the module or an entire year, delaying graduation.

Policies vary by university, so check your specific program's rules or speak with your academic advisor for exact details.