Study:
A study enrolled 72,000 people (most between 50 and 80 years old). All of them were free of diagnosed heart disease or cancer at the start of the study.
Finding:
The people who did only 15 minutes per week of vigorous physical activity had a 17% lower risk of death compared with people who were inactive.
With about 50 minutes vigorous exercise per week, death from any cause was reduced by 36%.
Suggestion:
If you do not like vigorous physical activity, moderate exercise like brisk walking at least 150 minutes per week, and ideally 300 minutes per week, which means 45 minutes per day. Your activity can be done in short bursts.
Source: https://www.health.harvard.edu/exercise-and-fitness/whats-the-minimum-amount-of-exercise-i-need-each-week