15-20M people over (at max) 4 years would be as much as 5 million per year, which is more than double "some years". Even in the most generous (slow) version of

15-20M people over (at max) 4 years would be as much as 5 million per year, which is more than double "some years". Even in the most generous (slow) version of this "deportation" scheme, the numbers are much higher than have been operated in the past.