How come no one mentioned the fantastic four impossible timeline?
Seriously. Every marvel movies are dissected frame by frame for Easter eggs and fam theories but watching F4 for the first time no one ever talked about that movie should have end after 40 minutes , when they blew their FTL up around a black hole??? So… they needed the ftl to reach galactus, but on the way back, they can just make a detour around a black hole to stop the surfer for a month and reach earth without FTL in the meantime???? You need a generation ship just to get out of the solar system at conventional speed. But they come back in a month??? What.the. F.???
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They did a slingshot around the neutron star to reach a speed of 88% the speed of light, allowing then to return to earth in a reasonable amount of time.
Rewatch the scene, Reed explicitly calls out that they have to reach 88% of the speed of light.
FTL isn't exempt from time dilation, you need to "fold space" in some manner to avoid that. Faster than Light is just travelling faster than the speed at which light travels, it's not magic making all of the rules of physics disappear.
Your travel time isn't necessarily hundreds of years, it all depends on the distance between the origin and destination. If I travel 88% the speed of light to Jupiter, it's not hundreds of years.
It's also worth noting, if you paid attention, the FTL drive in Fantastic 4 appears to be some form of folding space or wormhole, as evidenced by them using the image of a tunnel implying that they were travelling outside of normal space, so it wasn't actually a FTL drive it was a "Warp" drive or "Hyperspace" drive.
If you want to be \*really\* technical about it, the problem there wasn't the travel at 88% of the speed of light, it's that reaching 88% the speed of light takes a massive amount of energy and the gravitational forces of the neutron star would've crushed the ship because of the proximity it would've needed to pick up enough gravity to get it to 88% light speed in a slingshot. The ship couldn't hold together below 88%, it would've crushed like a tin can long before it got to 88%.
The other actual problem is that they realistically had no way to stop. Their thrusters weren't strong enough to get to 88% lightspeed, so they had no way to slow down from 88% lightspeed in a reasonable timeframe.
But, as others have said, it's not a movie trying to model real physics.
FTL means faster than light. Meaning you're trying at the speed of light reaching said destination. For example it takes 8 mins for the light of our sun to reach Earth mean theoretically a craft with a FTL drive would take less than 8 minutes to reach the Sun.
We don't know exactly but let's assume it took them anywhere between a few hours to a day to reach Galactus in whatever system he was in. Reed explicit says they used the slingshot method (a real thing btw) to produce enough speed to put them on trajectory to Earth at 88% of the speed of light equating to their travel of a month. I'm not a physicist and I'm not going to do the math to figure out the distance from Earth but this is a direct reference to Einstein's theory of relativity.
[Time Dilation Calculator - With Examples](https://www.emc2-explained.info/Dilation-Calc/)