Well, if you average 20mins a time, by 365 days a year, thats 7,300 mins a year. Say on average 70 years. Thats 511,000 mins in a lifetime.
Don't worry about it just sit down let it out and move on with your life what does it matter? What kind of person honestly needs to know this
Here's a much better question: Why do you want to know such a thing? Lol