How long does it take to become more flexible with yoga?

Flexibility changes at different rates because bodies are different. Anatomy, age, previous activity, injury history and the kind of yoga you practise all matter. Research shows that regular yoga can improve flexibility, but there is no honest promise that a particular pose will arrive in four weeks or twelve weeks.

The yogic approach is more useful than chasing a deadline. Practise consistently, warm the body appropriately, breathe rather than fight, and allow range to develop without turning sensation into a competition.

You may eventually discover that the greater benefit is not how far you can move, but how intelligently you can inhabit the range you have. Flexibility without awareness is not the goal of yoga.