How many heart beats does one have in a second for the whole of his life?

The question has no single answer as the number of heartbeats varies from person to person and throughout their life.

For adults, the heart rate typically ranges from 60 to 100 beats per minute (bpm), but can be lower or higher depending on individual factors such as age, fitness level, and genetics.

Multiplying the average heart rate per minute (say 75 bpm) by the average life expectancy (say 75 years) and then by the number of minutes in a year (525,600 minutes) provides an approximate estimate of the number of heartbeats a person might have throughout their life. This calculation would give a rough estimate of about 2.9 billion heartbeats over a 75-year lifetime.

However, it's worth noting that this is just an estimate, and individual circumstances and variations can significantly affect the actual number of heartbeats a person experiences in their lifetime.