[tialaramex]

A bit more than 50 years. Grace Hopper retired in 1966. It's true that Grace kept un-retiring, but the most crucial stuff is all before she retired. Invention of what we'd think of as a linker-loader (which Grace called a compiler) and of the broad concept of high level programming languages all happens in the 1950s.

[rswail]

I rounded down to the nearest half-century :)

I hope to live through to 2050, just to see what's going to happen.