The effect is called time dilation. The section of interest here is „Time dilation caused by a relative velocity“:

https://en.m.wikipedia.org/wiki/Time_dilation

I’m aware of time dilation, my point was that a “week vacation” to something “over 4 light years” away is just hyperbolic.

Nope! If you obtain the full speed of light then a) you're not made of baryons anymore so congratulations on that and b) no time passes whatsoever between your being emitted in some tight laser beam on planet A, and being transcribed on planet B, from your perspective.

None. Photons don't experience time, they are time.

Not exactly. For you to think you are traveling 20x faster than light, your friends that stayed at home would have to see you traveling at 0.99995c. For 233x faster than light, that's a lot of 9's in that number.

I get 0.999c for 20x and 0.99999c for 220+

I'll trust your numbers more than mine.

But, for all intents and purposes, this is impossibly fast ;-)

Unless you are on the Bistromath, that is.

There is no faster than light, I can't parse this statement.

Distance divided by [time experienced by traveler]. GP is not saying that traveler went faster than light.

From the passenger's point of view, yes. For everyone else you'd be veeeery close to c, but not quite there.

My point was it’s hyperbolic. You’d have to be going so close[0] to C that it’d be impossible.

[0] about 0.99999c if what someone else in this thread said is correct