The Falcon and the Winter Soldier is a Disney+ series, not a single film — so there is no single runtime. It consists of 6 episodes released weekly in Spring 2021.
Episode Runtimes:
Total runtime: approximately 318 minutes (5 hours 18 minutes) if you watch all episodes back-to-back.
Pro tip: The finale is notably longer and more action-packed than the other episodes — Marvel saves the best set pieces for last. If you are planning a watch session, plan for 6-8 hours across multiple sittings rather than one marathon.