Board Thread:Warhammer 40k General Discussion/@comment-24.254.200.119-20171118032818/@comment-2045915-20171118125752

Impossible to determine. No source has ever given a fixed ratio of how fast travel through the Warp is in comparison to the same distance in realspace. All we know is that the farther the distance in light years, the longer the time spent in the Warp. But there is no hard and fast rule, this isn't Star Trek's Warp drive with its set speed limits. So the best answer is indeed the "speed of plot." Your best bet would be to determine how many light years distant the Calixis Sector is from Terra, but I am not aware of any source which ever detailed that. I would suggest looking in the Rogue Trader RPG books which might have travel times between systems in the Koronus Expanse and the Calixis Sector which could give you a starting point. I would suggest bringing this up in the wiki's Discussions app and asking the community there. The forums are rarely used anymore since we brought the community app online. Click on the Discussions tab above to go there and restate your question. You're more likely to get an answer. Other than that, look to the Rogue Trader RPG for a possible answer.