

Some ion trajectories involve constant low acceleration. It really adds up time. You accelerate halfway there, then decelerate the rest of the way.
The dawn spacecraft mission to ceres has 48,000+ hours of gentle acceleration under ion propulsion. That’s 5.5 years of firing. But it gets over 38,620 km/h of delta-v (acceleration).
https://www.jpl.nasa.gov/news/nasas-dawn-spacecraft-fires-past-record-for-speed-change/

When they called the function, they didn’t specify any cells. The copilot function, like any other Excel function, cannot see cells that aren’t given to it.
The second argument is blank, so it just Gave a typical answer to a sum question.