How long does it take Starship to get to Mars?

It's worth separating the plan from the record: so far no Starship has made the trip to Mars, so any duration is a forecast rather than a measurement. SpaceX's roadmap calls for the first Starships to fly uncrewed, with the number of vehicles growing on each following opportunity, which recurs every 26 months.

The duration the company cites, three to four months, depends on a piece of technology that is not yet proven: in-orbit refueling. A Starship that departs for Mars with full tanks can afford a faster, more energy-intensive trajectory; if it leaves with less propellant, the transit stretches out. That is the real bottleneck of the Mars timeline, more than the vehicle itself or its payload capacity.

For comparison, missions that have already made the trip use minimum-energy trajectories: with chemical propulsion, NASA puts the journey at seven to ten months, citing an interplanetary cruise phase of around 200 days, and notes that the favorable alignment between Earth and Mars only recurs every 26 months. Shortening that trip isn't impossible, but it costs propellant at both ends, since the vehicle must accelerate harder on departure and shed more speed on arrival, with a more violent atmospheric entry on a planet with very thin air. Until a flight actually happens, the three-to-four-month range remains an engineering promise, not a record.