Who holds the record for the most cumulative time spent in space, mostly on the ISS?

Oleg Kononenko holds the record for the most cumulative time spent in space, with most of that time accumulated aboard the ISS.

The Russian cosmonaut passed Gennady Padalka's previous record on 4 February 2024 during his fifth spaceflight. By the end of that mission, Kononenko had accumulated more than 1,100 days in orbit, making him the first person to exceed 1,100 total days in space. His time was spread across multiple long-duration expeditions rather than one uninterrupted stay.

Kononenko's record is measured by cumulative time, meaning all of a person's space missions are added together. That is different from the record for the longest single spaceflight, which belongs to cosmonaut Valeri Polyakov for his extended stay aboard the Mir space station.

The other choices are notable spaceflight record-holders but do not lead this category. Peggy Whitson holds the record for the most cumulative time in space by an American, while Scott Kelly completed a famous one-year ISS mission. Gennady Padalka is the previous overall record-holder.