You need to include the commuting time into the productivity calculation. If a person has to commute 1 hour for 200 days a year while working for 40 years, this

You need to include the commuting time into the productivity calculation. If a person has to commute 1 hour for 200 days a year while working for 40 years, this would result in 8,000 hours of work-related unproductivity during a life, which is equivalent to 5 full years of work. This is the benchmark that you first have to surpass. In other words: such a person needs to be on average 12.5 percent more productive on site than at home to break even.