It will take some time for the ISS to come down to Earth in the 2030s. NASA says it will take about 12 to 18 months to naturally fall back to our planet before a new SpaceX deorbit vehicle pushes it back into Earth's atmosphere.

ISS could 'drift down' for a year before SpaceX vehicle destroys it in Earth's atmosphere

Source: space
Source Link: https://www.space.com/iss-deorbit-destroy-spacex-vehicle-18-months