17:52 Polyester adds a slight amount of flexibility to the fabric, but it doesn’t significantly improve elasticity on its own. If the goal is to enhance stretchiness, a small percentage of spandex (or elastane) is typically added to the cotton-polyester blend. The primary role of polyester in such blends is durability, shape retention, moisture resistance, wrinkle resistance, faster drying as well as cost efficiency. While it can complement the fabric’s overall flexibility, it doesn’t provide the same level of elasticity as spandex. For fabrics where stretch is key-like activewear or athleisure garments-a combination of cotton, polyester, and spandex is often used.
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