The time dilation on that planet—one hour equals 7 Earth years—seems extreme. To get that, you'd apparently need to be at the event horizon of a black hole. Yes. You can calculate where you must be to have that level of time dilation, and it's extreme.

No, the idea that "1 hour on Earth equals 7 years in space" is a science-fiction myth popularized by the movie Interstellar. In reality, time dilation does occur due to Einstein’s Theory of Relativity, but the effect is infinitesimal in any scenario humans currently experience. For example, astronauts on the International Space Station (ISS) age roughly 0.007 seconds less than people on Earth after six months in orbit. To actually experience a "1 hour to 7 years" ratio, you would need to be orbiting extremely close to a supermassive black hole (like the fictional Gargantua) or traveling at 99.999999% the speed of light. A supportive peer correction: in our solar system, there is no place where time moves that differently. You can safely travel to Mars or the Moon in 2026 without worrying about returning to an Earth that has aged decades while you were only gone for a few hours.