Hypothetically, how hard would each person in the world have to work in order to provide for everyone's basic needs?

If all 6 billion people in the world simultaneously agreed to spend part of their time working at a job which was involved in the production, distribution, or maintenance of every person’s basic needs, roughly how much do you think each person would need to work?

I am assuming that there would be systems in place to ensure both quality control and good working conditions, that people would have a reasonable commute, and that anyone would be able to switch jobs and receive training at another if they wished.

I define basic needs as access to the following:

- Fresh, clean air
– Fresh, clean water
– Healthy, tasty food
– A safe, comfortable place to live
– Effective and efficient sanitation
– Competent, compassionate medical care
– Competent, compassionate education