There is definitely not enough tests to test the entire population of a country every 36 hours. Even assuming a single person/testing machine could do 5000 test

There is definitely not enough tests to test the entire population of a country every 36 hours. Even assuming a single person/testing machine could do 5000 tests a day (no idea if that's a reasonable number or not) to test every American every 36hrs would need like 40000 setups.