To begin with, I am not aware of any reliable statistics. I can only draw on my personal experience and summarize a number of related Google search results. It is obvious, I hope, that it is impossible to spend more than 3 clock hours talking...
To begin with, I am not aware of any reliable statistics. I can only draw on my personal experience and summarize a number of related Google search results. It is obvious, I hope, that it is impossible to spend more than 3 clock hours talking...