Time dilation isn’t dramatic as you might think. For example, at 66% the speed of light, you only get a 1.3 (or 30%) time difference. You have to get into the

Time dilation isn’t dramatic as you might think. For example, at 66% the speed of light, you only get a 1.3 (or 30%) time difference. You have to get into the 90% range for something meaningful. Even at 96% the speed of light, it’s a 4x speed difference. 99.99% is 80x time difference. 99.999% is 240x time diff. To have time speed up to the point of civilizations rising and falling in a matter of days, you’d need to be traveling at 99% (with a few 9s in the decimal places). Though at relative speeds that high, it would be difficult to actually see what’s happening. Here’s a calculator that’ll show you time dilation at different speeds https://keisan.casio.com/exec/system/1224059993 https://keisan.casio.com/exec/system/1224059993