I couldn't find anything about the time it takes for a ship to move through the void. Does anybody know of any rules, or of any fluff that gives an idea of how many days it takes for a ship to travel from planet to planet or from warp point to planet?

 Not trying to be a smart ass but there's a very obvious indicator of how fast a ship can move through the void. Its speed.

Fluff is inconsistent on this point; some pieces indicate that it takes weeks to get to the goldilocks zone of a system from the outer fringes, while in others it's bare hours. I tend to hedge it at about a week at full burn.

As a sidenote, if you assume a Speed of 8 VU, one VU being 10,000km, it would take approximately 4.21 years to get from Earth to Pluto.

I completely overlooked that, but you're very right

However if I set the speed of an average ship (about 6) and the length of a void unit (10,000km) against the distance in our own solar system the voyage gets to be rather long. A warp translation point is, I think, always at the edge of a solar system, so (according to wikipedia) the farthest distance of pluto to the sun is about 50AU, or 7,500,000,000km (to get really clear of the solar system you'd probably have to travel even further). An average ship would travel 60,000km per half our, or 2,88 million km per day. To get to earth you'd have to travel at least 49AU, or 73,500,000,000km, making it a trip lasting about 70 years, and then you would have to make a return trip to travel to a warp translation point...

Errant said:

Actually I could live with an inconsistency like this. That would just mean that I as a GM could decide the amount of time they'd spent inside a system, and make it anything from a couple of hours to a couple of weeks. However having to make it anything from 4 years to 70 years for a one way trip would make the characters rather short lived

ships can make 2 warp jumps. 1 to get to the system and another to get close to ,relatively speaking, to planets. look at frozen reaches. the orks jump into the middle of your fleet. it is insanely close to the planet,within hours, but jump in a day or two away from the one you want after you have taken a look from out system. it's more dangerous but it saves a lot of time. 

 Yeeees, but about six of the nine vessels that attempt that are torn apart by the system's gravity well. I doubt most Rogue Traders would be terribly happy with those odds

that was my point about the distance from the planet the orks jumped. they jumped into real space within 12 hours of the planet. they lost around 1/4 of their ships as written in the adventure. jump to 2 days out from the planet. outside the planetary and moons grav well but still much closer than pluto's orbit. 

 I'm 95% certain the adventure specifically states that the ork role are torn apart by the STAR's gravity well, not the planet's. 

Anyway, I found a paragraph that talks about void travel outside of combat. It pretty much leaves it up to the GM but says ships should move a lot faster out of combat than in combat, similar to combat speed and narrative speed for vehicles.I'm pretty sure the paragraph was in RT core but I'm not positive.  

Page 183 on in the core rulebook talks about traveling through the warp 

Red Bart said:

I think one could argue that in narrative time you can continue to accelerate and accelerate for hours and hours, eventually reaching speeds faster than speed x VU.  I think going 1/4 the speed of light could be reasonable, making 50 AU's take only a few days.  I believe the book says it takes several weeks to cross a planetary system (which I would interpret as the full width of it).

If you are trying to bring real-world physics into this, you're in for some pain.

Remember, there is no air-resistance in space, the only "drag" you have to worry about is inertia. And once overcome, a moving object will keep moving at a constant velocity without any further thrust.

At "Full burn", you're not measuring a constant "max speed", you're measuring a constant "max acceleration". As long as you're working those engines, you will keep going ever faster and faster, until you eventually approach light speed and relativity kicks in and limits your effective speed.

So for practical purposes I'd rule that the speed value for a ship (ie 6 VU p Combat turn) is an approximation of the distance a ship can cover while turning and maneuvering (and thus not benefiting from extended acceleration). But for long trips, no ship will be limited to this limit.

Even at a modest 1G acceleration, you will travel 1 AU in the first 2 days. At that point, your speed will be over 6 million kilometers pr hour (about 609 Void Units/hr), or about 1 AU / day. Keep accelerating, and you'll hit 2 AU / day after 4 days, 4 AU after 8 days, and so forth.

At your journeys half-way point, you would need to start decelerating at 1 G, in order to end up stationary upon your arrival. Whether this is necessary to perform a warp jump is not known, but let's assume so.

To travel 50 AU then, from standstill and to a complete stop, you would need to accelerate at 1 G for 10 days. This would take you 25 AU, and leave you with a top speed of some 3050 VU / hr. Then you simply hit the brakes (or more likely, turn the ship around and let the engines thrust as normal giving you the same deceleration as you had as acceleration). For the next 10 days you will cover the same distance, and end up stationary on the edge of our solar system after 20 days of travel.

If you did not need to slow down, you could be there after only 14 days at "full burn", but then you'd be moving at almost 4300 VU/h :)

And this is at 1 G. The level of acceleration you experience if you jump of something here on earth. With fancy-gravplating and inertial dampeners and other sci-fi tropes you could easily increase this, drastically reducing travel times. At 2G you'd just need 7 days before reaching your mid-point. At 3G, you're down to 6.

Of course, keeping this "full thrust" thing going would require a lot of fuel, which would require storage. Or some fancy extract-from-space-as-you-go thing. Or a lot of handwavium.

Or instead of constant acceleration, just accelerate until you're satisfied and turn off your engines and then coast to your warp transition point. Would save a bunch of fuel. Take a little longer, but cost less fuel.

As a GM, I go for approximately 2 weeks at "full burn" to get to safe warp tansit range for a normal star system (ie, like our own Sol star system).  Modify that time by the max G accel of the ship class (roughly), a 2g ship will take 2 weeks, a 1g ship 4 weeks etc.  A formula for that would be time in days = 28/g.  Seems to work in my campaigns, and makes faster ships (in strategic terms) have a bit of an edge with travel times.

As an example, take the Ambition and Dictator class cruisers, both have a combat speed of 5VU, but the ambition has 3g sustainable acceleration vs the dictators 2.5.  The Ambition can make a safe warp-point in 9 days and 8 hours while the Dictator can get there in 11 days and 5 hours.

Darth Smeg, any chance you could work up a light formula like the one Hygric uses? Going on your 1g = 20 days to clear the Sol system, something like

Small System: 10/G Days

Medium System: 20/G Days (Sol size)

Large System: 30/G Days

Would that be anywhere near accurate?

Problem is the equation is not linear. 

However, the formula is something like this: Time taken (in days) = Square root (408,9 / G)