[ubernostrum]

at least 15 years (last time I checked) of employment before you're up to 4 weeks per year.

Except you can't get there, because you can't work at 18F for more than four years. Or at least that was what I was told when I looked into it last year.

(I have nothing against 18F, by the way -- if it's something you're interested in you should definitely look into working there, and some awesome people I know are currently there)