In Interstellar, time on Miller’s planet moved slower due to the immense gravity of the black hole Gargantua, near which the planet was located. According to Einstein’s theory, the stronger the gravity, the slower time flows.
As we remember, one hour on Miller’s planet was equivalent to approximately seven years on Earth. This effect is not just visually striking; it becomes a central plot element, creating a dramatic gap between the time spent by the characters on the planet and the time that passes on Earth.

The planet’s proximity to the black hole makes every moment on Miller’s planet invaluable, while the loss of connection with familiar timeframes adds emotional depth and intensity to the scenes where the characters struggle against the relentless passage of time.
To determine how much time passed on Miller’s planet and on Earth in Interstellar, no calculator is needed — just careful viewing of the film. Three hours and twenty-three years, respectively. An unimaginably long period, during which catastrophic events unfolded on Earth, and all of the protagonists’ loved ones aged irreversibly by decades.