[antidesitter]

I believe the GP is talking about increasing the number of doctors, not their years in residency.

[pc86]

You learn how to do your entire specialty during residency. If you cut the number of hours, you have the same amount to learn in less time.

[MereInterest]

That's on the assumption that amount learned per hour remains constant as hours worked increases.

[scott_s]

And that sleep deprivation has no effect on learning ability.