The four U.S., Russian and Japanese astronauts pulled up in their SpaceX capsule after launching from NASA’s Kennedy Space Center in Florida. They will spend at least six months at the orbiting lab, swapping places with colleagues up there since March. SpaceX will bring those four back as early as Wednesday.

The four Crew-11 crew members joined seven other astronauts in the International Space Station early Saturday morning following a 15-hour journey from Florida.

An international crew of four astronauts launched toward the International Space Station from Florida on Friday aboard a SpaceX rocket, embarking on a routine NASA mission that could be the first of many to last a couple months longer than usual.