Increase the amount of time you spend exercising by walking between 15 and 20 minutes.

步行15到20分钟来增加你用于运动的时间。

《柯林斯英汉双解大词典》

Fortunately, all of my meetings were within 10-15 minutes' walking distance from my hotel. As a result, I walked rather than take taxis.

幸运的是，从酒店到所有会议地点步行都只需要10到15分钟，所以我总是走路，而没有打车。

youdao

Repeat these intervals for 10-15 minutes, then do a 10-minute walking cool down.

重复上述的间隔10-15分钟，然后步行10分钟放松一下。

youdao

About 15 minutes later, he was walking back to his friends when the first bomb went off.

NPR: Fla. Runner Gets Photo Of Suspect Fleeing Marathon

The 2008 Physical Activity Guidelines for Americans released by the Department of Health and Human Services recommends that adults age 18 to 64 engage in at least 2.5 hours of moderate-intensity aerobic exercise (brisk walking, biking) or an hour and 15 minutes of vigorous activity (like running) each week.

CNN: Is a shorter but harder workout better?

The study exposed 40 healthy participants with a mean age of 27 to two minutes of slow split-belt walking, then to a 15-minute period in which one belt went much faster than the other so that participants began to drag one foot, simulating a limp.

WSJ: Split-Belt Treadmill Therapy for Stroke Patients