Stumpokapow
listen to the mad man
Woah wait Duckworth also has four years in the House and her military experience.
That's more than FDR or Carter and as much as Kennedy.
FDR had 4 years as governor of New York, a far more complex and ambitious role than being part of the House delegation, as well as a past run for VP, 5 years in the cabinet, and he was running at a time before modern media where both campaigns and the bureaucracy were exponentially less complicated.
Kennedy had 6 years in the House and 8 years in the Senate.
Carter had 4 years as governor of Georgia (again, vastly more important than a house seat) and won due to a series of flukes in the primary and Ford's weakness in the general.
Duckworth at the time she would have to declare would have 4 years in the House and 2-3 in the Senate. I don't think military service below high command counts or should count for peanuts when running for President, although it may be a useful springboard to get a House or Senate seat on the way there.