Option 1 suggests that a heart-beat takes approximately 0.5 seconds. Option 2 says it takes around 0.8 seconds. Option 3 states that it takes 0.5 minutes, and option 4 claims it takes 1.0 minute. The correct answer is option 2.

A heart-beat actually takes around 0.8 seconds. It is important to note that the time for a heart-beat can vary from person to person and can be influenced by various factors such as age, physical activity, and overall health. It is also worth mentioning that the average resting heart rate for adults falls between 60 to 100 beats per minute. Additionally, during physical activity or exercise, the heart rate can increase. Overall, 0.8 seconds is a good approximation for the time required for a heart-beat, but individual variations should be considered.