I wonder if that “weeks instead of months” thought includes deceleration?
Every time I read an article like this, I think about that same thing.
Sure, if had a FTL craft, we could PASS BY Pluto in about 15 minutes.
The problem, (as you obviously know), is that a trajectory designed to allow you to go into orbit around a body in space is a GIANT "S".
The faster you go, the BIGGER the "S" curves must be to arrive at the destination.
Going FASTER only means that you travel FURTHER. The TIME to get there is the same.
CURRENTLY, there is no 'straight line' shot from point A to point B as a trajectory for any outer space craft.
SO.... if we were able to go the speed of light, we could only accelerate to that max until the halfway point. Then we would need some way to 'brake' the craft. The speed required to drop into orbit is nowhere near the speed of light.
Currently we have no method of 'slowing' the craft in proportion to the ability to accelerate.
Bottom line,using current technology for interplanetary space craft, there is a 'best' speed for going to Mars, and even if you could go faster, you wouldn't get there any sooner.