For cardiovascular exercise to improve endurance, how long should it last at a minimum?

To effectively improve cardiovascular endurance, the recommended duration for exercise is generally acknowledged to be at least 20 minutes. This timeframe allows the body to effectively adapt to increased levels of physical exertion, leading to enhanced cardiovascular function, improved oxygen delivery, and better utilization of energy systems.

Shorter durations such as 10 or 15 minutes may not provide sufficient time for the heart rate to elevate into the target training zone or for the body to experience the physiological adaptations that occur with sustained aerobic activity. Additionally, while 30 minutes is beneficial and often recommended for general health and fitness, the threshold of 20 minutes serves as a key benchmark for reaping the endurance benefits from cardiovascular endeavors.